638632410725 has 48 divisors (see below), whose sum is σ = 823921848960. Its totient is φ = 490651603200.

The previous prime is 638632410707. The next prime is 638632410737. The reversal of 638632410725 is 527014236836.

It is a de Polignac number, because none of the positive numbers 2^k-638632410725 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638632410725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22229120 + ... + 22257830.

It is an arithmetic number, because the mean of its divisors is an integer number (17165038520).

Almost surely, 2^638632410725 is an apocalyptic number.

It is an amenable number.

638632410725 is a deficient number, since it is larger than the sum of its proper divisors (185289438235).

638632410725 is a wasteful number, since it uses less digits than its factorization.

638632410725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29070 (or 29065 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 638632410725 in words is "six hundred thirty-eight billion, six hundred thirty-two million, four hundred ten thousand, seven hundred twenty-five".