63681604225 has 12 divisors (see below), whose sum is σ = 80259702460. Its totient is φ = 50110113600.

The previous prime is 63681604117. The next prime is 63681604237. The reversal of 63681604225 is 52240618636.

It can be written as a sum of positive squares in 6 ways, for example, as 6192430864 + 57489173361 = 78692^2 + 239769^2 .

It is a de Polignac number, because none of the positive numbers 2^k-63681604225 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20877690 + ... + 20880739.

Almost surely, 2^63681604225 is an apocalyptic number.

It is an amenable number.

63681604225 is a deficient number, since it is larger than the sum of its proper divisors (16578098235).

63681604225 is a wasteful number, since it uses less digits than its factorization.

63681604225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41758500 (or 41758495 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 63681604225 in words is "sixty-three billion, six hundred eighty-one million, six hundred four thousand, two hundred twenty-five".