639916109507624 has 16 divisors (see below), whose sum is σ = 1202575832224800. Its totient is φ = 319229220914352.

The previous prime is 639916109507603. The next prime is 639916109507677. The reversal of 639916109507624 is 426705901619936.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91104226202 + ... + 91104233225.

It is an arithmetic number, because the mean of its divisors is an integer number (75160989514050).

Almost surely, 2^{639916109507624} is an apocalyptic number.

It is an amenable number.

639916109507624 is a deficient number, since it is larger than the sum of its proper divisors (562659722717176).

639916109507624 is a wasteful number, since it uses less digits than its factorization.

639916109507624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182208459872 (or 182208459868 counting only the distinct ones).

The product of its (nonzero) digits is 132269760, while the sum is 68.

The spelling of 639916109507624 in words is "six hundred thirty-nine trillion, nine hundred sixteen billion, one hundred nine million, five hundred seven thousand, six hundred twenty-four".