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

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). 63 is weak (63+36=99), but 64 is very strong.

In science


In other fields

Sixty-three is:

In sports

Historical years

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

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