63625561 has 2 divisors, whose sum is σ = 63625562. Its totient is φ = 63625560.

The previous prime is 63625537. The next prime is 63625571. The reversal of 63625561 is 16552636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60840000 + 2785561 = 7800^2 + 1669^2 .

It is a cyclic number.

It is not a de Polignac number, because 63625561 - 2⁹ = 63625049 is a prime.

It is not a weakly prime, because it can be changed into another prime (63625571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31812780 + 31812781.

It is an arithmetic number, because the mean of its divisors is an integer number (31812781).

Almost surely, 2^63625561 is an apocalyptic number.

It is an amenable number.

63625561 is a deficient number, since it is larger than the sum of its proper divisors (1).

63625561 is an equidigital number, since it uses as much as digits as its factorization.

63625561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 63625561 is about 7976.5632323702. The cubic root of 63625561 is about 399.2183924689.

The spelling of 63625561 in words is "sixty-three million, six hundred twenty-five thousand, five hundred sixty-one".