63 (number)

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63 (sixty-three) is a natural number following 62 and preceding 64.

<< 60 61 62 63 64 65 66 67 68 69 >> List of numbers -- Integers 0 10 20 30 40 50 60 70 80 90 >>
Cardinal	63 sixty-three
Ordinal	63rd sixty-third
Factorization
Divisors	1, 3, 7, 9, 21, 63
Roman numeral	LXIII
Binary	111111
Hexadecimal	3F

Contents 1 In mathematics 2 In science 2.1 Astronomy 3 In other fields 4 Historical years

[edit] In mathematics

Although a number of the form 2ⁿ - 1, 63 is not a Mersenne prime since n is not prime and 63 is certainly not prime either. It is a Woodall number and a Harshad number. It is a highly cototient number. It is a repdigit in base 4 (333).

[edit] In science

• The atomic number of europium, a lanthanide

[edit] Astronomy

• Messier object M63, a magnitude 8.5 galaxy in the constellation Canes Venatici, also known as the Sunflower Galaxy.

• The New General Catalogue object NGC 63, a spiral galaxy in the constellation Pisces

• The Saros number of the solar eclipse series which began on -879 April 20 and ended on 401 May 29. The duration of Saros series 63 was 1280.1 years, and it contained 72 solar eclipses.

• The Saros number of the lunar eclipse series which began on -758 October 12 and ended on 739 March 29. The duration of Saros series 63 was 1496.5 years, and it contained 84 lunar eclipses.

[edit] In other fields

Sixty-three is:

• The code for international direct dial calls to the Philippines
• The registry of the U.S. Navy's aircraft carrier USS Kitty Hawk (CV-63)
• The number of the French department Puy-de-Dôme
• A card game, popular in Carleton County, New Brunswick
• The Stoner 63, a machine gun
• The number of chromosomes found in the offspring of a donkey and a horse

[edit] Historical years

63 A.D., 63 B.C., 1963, 2063, etc.