12640250664 has 64 divisors (see below), whose sum is σ = 35687448000. Its totient is φ = 4144340160.

The previous prime is 12640250639. The next prime is 12640250729. The reversal of 12640250664 is 46605204621.

12640250664 is a `hidden beast` number, since 1 + 2 + 640 + 2 + 5 + 0 + 6 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 466494 + ... + 492845.

It is an arithmetic number, because the mean of its divisors is an integer number (557616375).

Almost surely, 2^12640250664 is an apocalyptic number.

It is an amenable number.

12640250664 is an abundant number, since it is smaller than the sum of its proper divisors (23047197336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12640250664 is a wasteful number, since it uses less digits than its factorization.

12640250664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959415 (or 959405 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 12640250664 in words is "twelve billion, six hundred forty million, two hundred fifty thousand, six hundred sixty-four".