55 (number)

Article Index for
55

Information About

55 (number)

SHOPPER'S DELIGHT


Cardinal	55 fifty-five
Ordinal	55th fifty-fifth
Factorization	$5\cdot 11$
Roman Numeral	LV
Binary	110111
Hexadecimal	37

IN MATHEMATICS

Fifty-five is a Heptagonal Number , a Centered Nonagonal Number , and a Triangular Number (the sum of the numbers 1 to 10) and a Square Pyramidal Number (the sum of the squares of the integers 1 to 5). It is also a Fibonacci Number (the largest Fibonacci number to also be a triangular number) and a Kaprekar Number .

55 is a Semiprime .

IN 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

The Saros number of the Solar Eclipse series which began on -1255 July 6 and ended on 43 August 23 . The duration of Saros series 55 was 1298.1 years, and it contained 73 solar eclipses. The Saros number of the Lunar Eclipse series which began on -935 April 25 and ended on 345 June 1 . The duration of Saros series 55 was 1280.1 years, and it contained 72 lunar eclipses.

IN OTHER FIELDS

Fifty-five is also:

The Atomic Number of Caesium .

The number of delegates who attended the United States Constitutional Convention .

In US Gallon s, a common size of Drum containing liquids, see 55 US Gallon Drum .

In Miles Per Hour in many states of the United States , a common speed limit; it was the national speed limit for a time during the Energy Crisis of the late 1970s .

---This speed limit was also the subject of a song by Sammy Hagar , ''I Can't Drive 55''.

In years of marriage, the emerald Wedding Anniversary .

The Code For International Direct Dial phone calls to Brazil .

The number of European Route E55 from Helsingborg , Sweden to Greece

The designation of United States Interstate 55 , a freeway that runs from Louisiana to Illinois .

The year AD 55 , 55 BC , or 1955 .

A song produced by .

Restaurant Slang for Root Beer .

The name of a song by British Indie Rock Band Kasabian . The song was released as a B side to Club Foot and was recorded live when the band performed at London's Brixton Academy.