639916109507625 has 32 divisors (see below), whose sum is σ = 1064826334401024. Its totient is φ = 341286691680000.

The previous prime is 639916109507603. The next prime is 639916109507677. The reversal of 639916109507625 is 526705901619936.

It is not a de Polignac number, because 639916109507625 - 2¹¹ = 639916109505577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639916109507625.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64023057 + ... + 73340193.

It is an arithmetic number, because the mean of its divisors is an integer number (33275822950032).

Almost surely, 2^{639916109507625} is an apocalyptic number.

It is an amenable number.

639916109507625 is a deficient number, since it is larger than the sum of its proper divisors (424910224893399).

639916109507625 is a wasteful number, since it uses less digits than its factorization.

639916109507625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9500306 (or 9500296 counting only the distinct ones).

The product of its (nonzero) digits is 165337200, while the sum is 69.

The spelling of 639916109507625 in words is "six hundred thirty-nine trillion, nine hundred sixteen billion, one hundred nine million, five hundred seven thousand, six hundred twenty-five".