55 (fifty-five) 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 ...

following 54 and preceding 56.

Mathematics

55 is *a triangular number (the sum of the consecutive numbers 1 to 10), and a

doubly triangular number In mathematics, the doubly triangular numbers are the numbers that appear within the sequence of triangular numbers, in positions that are also triangular numbers. That is, if T_n=n(n+1)/2 denotes the nth triangular number, then the doubly triangul ...

. *the 10th Fibonacci number. It is the largest Fibonacci number to also be a triangular number. * a square pyramidal number (the sum of the squares of the

integer An integer is the number zero (), a positive natural number (, , , etc.) or a negative integer with a minus sign ( −1, −2, −3, etc.). The negative numbers are the additive inverses of the corresponding positive numbers. In the languag ...

s 1 to 5) as well as a heptagonal number, and a centered nonagonal number. *In base 10, it is a Kaprekar number.

Science

*The atomic number of

caesium Caesium (IUPAC spelling) (or cesium in American English) is a chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of , which makes it one of only five elemental metals that a ...

Astronomy

* Messier object M55, a magnitude 7.0 globular cluster in the constellation Sagittarius *The New General Catalogue object NGC 55, a magnitude 7.9 barred spiral galaxy in the constellation

Sculptor Sculpture is the branch of the visual arts that operates in three dimensions. Sculpture is the three-dimensional art work which is physically presented in the dimensions of height, width and depth. It is one of the plastic arts. Durable sc ...

Music

* The name of a song by

Kasabian Kasabian ( ) are an English rock band formed in Leicester in 1997 by lead vocalist Tom Meighan, guitarist and occasional vocalist Sergio Pizzorno, guitarist Chris Karloff, and bassist Chris Edwards. Drummer Ian Matthews joined in 2004. Ka ...

. The song was released as a B side to ''Club Foot'' and was recorded live when the band performed at London's Brixton Academy. * "55", a song by Mac Miller * " I Can't Drive 55", a song by Sammy Hagar * " Ol' '55", a song by Tom Waits * Ol' 55 (band), an Australian rock band. * Primer 55 an American band * ''Station 55'', an album released in 2005 by Cristian Vogel * '' 55 Cadillac'', an album by Andrew W.K.

Transportation

*In the United States, the National Maximum Speed Law prohibited speed limits higher than from 1974 to 1987

Film

* '' 55 Days at Peking'' a film starring Charlton Heston and David Niven

Years

AD 55 AD 55 ( LV) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Caesar and Vetus (or, less frequently, year 808 ''Ab urbe condita''). Th ...

* 55 BC * 1755 * 1855 *

1955 Events January * January 3 – José Ramón Guizado becomes president of Panama. * January 17 – , the first nuclear-powered submarine, puts to sea for the first time, from Groton, Connecticut. * January 18– 20 – Battle of Yijiangs ...

Other uses

*'' Gazeta 55'', an Albanian newspaper *

Agitation and Propaganda against the State Constitution 55, or Agitation and Propaganda against the State ( sq, Agjitacion dhe Propagandë kundër shtetit), was a criminal offence in Communist Albania. This law was used from 1945 until 1991 and was part of the Constitution of the People's ...

, also known as Constitution law 55, a law during Communist Albania. *The code for international direct dial phone calls to

Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and Latin America. At and with over 217 million people, Brazil is the world's fifth-largest country by area ...

*A 55-gallon drum for containing oil, etc. *The Élysée, the official residency of the

French Republic France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...

president, which address is 55

rue du Faubourg-Saint-Honoré ''Ruta graveolens'', commonly known as rue, common rue or herb-of-grace, is a species of ''Ruta'' grown as an ornamental plant and herb. It is native to the Balkan Peninsula. It is grown throughout the world in gardens, especially for its bl ...

Paris Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 30th most densely populated city in the world in 2020. Si ...

References

{{Integers, zero Integers