640250855788 has 12 divisors (see below), whose sum is σ = 1120474739440. Its totient is φ = 320115215952.

The previous prime is 640250855779. The next prime is 640250855791. The reversal of 640250855788 is 887558052046.

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, 2411043 + ... + 2663386.

Almost surely, 2^640250855788 is an apocalyptic number.

It is an amenable number.

640250855788 is a deficient number, since it is larger than the sum of its proper divisors (480223883652).

640250855788 is a wasteful number, since it uses less digits than its factorization.

640250855788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105976 (or 5105974 counting only the distinct ones).

The product of its (nonzero) digits is 21504000, while the sum is 58.

The spelling of 640250855788 in words is "six hundred forty billion, two hundred fifty million, eight hundred fifty-five thousand, seven hundred eighty-eight".