166 (one hundred ndsixty-six) is the

natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''Cardinal n ...

following 165 and preceding 167.

In mathematics

166 is an even number and a

composite number A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Equivalently, it is a positive integer that has at least one divisor other than 1 and itself. Every positive integer is composite, prime, ...

. It is a

centered triangular number A centered (or centred) triangular number is a centered figurate number that represents an equilateral triangle with a dot in the center and all its other dots surrounding the center in successive equilateral triangular layers. The following ...

. Given 166, the

Mertens function In number theory, the Mertens function is defined for all positive integers ''n'' as : M(n) = \sum_^n \mu(k), where \mu(k) is the Möbius function. The function is named in honour of Franz Mertens. This definition can be extended to positive r ...

returns 0. 166 is a

Smith number In number theory, a Smith number is a composite number for which, in a given number base, the sum of its digits is equal to the sum of the digits in its prime factorization in the given number base. In the case of numbers that are not square-free ...

base 10 The decimal numeral system (also called the base-ten positional numeral system and denary or decanary) is the standard system for denoting integer and non-integer numbers. It is the extension to non-integer numbers of the Hindu–Arabic numeral ...

In astronomy

166 Rhodope Rhodope (minor planet designation: 166 Rhodope) is a dark background asteroid from the central region of the asteroid belt, approximately 55 kilometers in diameter. It was discovered on 15 August 1876, by German–American astronomer Christian P ...

is a dark

main belt The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies, of many sizes, but much smaller than planets, called ...

asteroid An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere. ...

, in the

Adeona family The Adeona or Adeonian family () is a large asteroid family that formed from the parent body 145 Adeona. Its spectral type is that of a carbonaceous C-type, with currently 2,236 asteroids identified as family members. Based upon simulation ...

of asteroids * 166P/NEAT is a periodic

comet A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process that is called outgassing. This produces a visible atmosphere or coma, and sometimes also a tail. These phenomena ar ...

and centaur (planetoid), centaur in the outer Solar System * HD 166 is the 6th magnitude star in the constellation Andromeda (constellation), Andromeda

In the military

* 166th Signal Photo Company (United States), 166th Signal Photo Company was the official photo unit in the 89th Division of George Patton, George Patton's Third Army (United States), Third Army in World War II * Convoy ON-166 was the 166th of the numbered ON convoys, ON series of merchant ship convoys outbound from the British Isles to North America departing February 11, 1943 * HMM-166, Marine Medium Helicopter Squadron 166 is a United States Marine Corps helicopter * was a United States Coast Guard United States Coast Guard Cutter, cutter during World War II * was a United States Navy yacht. She was the first American vessel lost in World War I * was a United States Navy during World War II * was a United States Navy during the World War I * was a United States Navy during World War II * was a United States Navy ship during World War II * USS Jamestown (AGTR-3), USS ''Jamestown'' (AGTR-3/AG-166) was a United States Navy ''Oxford''-class technical research ship following World War II

In sports

* Sam Thompson’s 166 RBIs in 1887 stood as a Major League Baseball record until Babe Ruth broke the record in 1921

In transportation

* British Rail Class 166 * The now-defunct elevated IRT Third Avenue Line, 166th Street station in the Bronx, New York * London Buses route 166 * Piaggio P.166 is a twin-engined push prop-driven utility aircraft developed by the Italy, Italian aircraft manufacturer Piaggio * Banat Air Flight 166 crashed on take-off en route from Romania on December 13, 1995 * Alfa Romeo 166 and 166 2.4 JTD produced from 1998 to 2007 * Ferrari 166 S, Ferrari 166 model cars produced from 1948 to 1953 ** Ferrari 166 Inter (1949) Coachbuilder, Coachbuilt street coupe and Cabriolet (automobile), cabriolet

In other fields

166 is also: * The year AD 166 or 166 BC * The atomic number of an element temporarily calle
Unhexhexium

External links

Number Facts and Trivia: 166

The Number 166

166th Street (3rd Avenue El)

References

{{DEFAULTSORT:166 (Number) Integers