99 (Number)

99 is the natural number following 98 and preceding 100.
Cardinal ninety-nine
Ordinal99th (ninety-ninth)
Factorization3^2 \cdot 11
Divisors 3, 9, 11, 33
Roman numeralXCIX
Binary1100011
Hexadecimal63

In mathematics

Ninety-nine is the ninth repdigit, a palindromic number and a Kaprekar number.

In science

In astronomy,
Messier object M99, a magnitude 10.5 spiral galaxy in the constellation Coma Berenices
The New General Catalogue object NGC 99, a magnitude 13.7 spiral galaxy in the constellation Pisces
The Saros number of the solar eclipse series which began on 235 June 3 and ended on 1515 July 11. The duration of Saros series 99 was 1280.1 years, and it contained 72 solar eclipses.
The Saros number of the lunar eclipse series which began on 55 March 24 and ended on 1835 May 12. The duration of Saros series 99 was 1280.1 years, and it contained 72 lunar eclipses.

In other fields

Ninety-nine is also:
   

 

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