56637531990 has 80 divisors (see below), whose sum is σ = 164006832528. Its totient is φ = 13941543744.

The previous prime is 56637531931. The next prime is 56637532043. The reversal of 56637531990 is 9913573665.

56637531990 is a `hidden beast` number, since 566 + 3 + 75 + 3 + 1 + 9 + 9 + 0 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2678812 + ... + 2699871.

Almost surely, 2^56637531990 is an apocalyptic number.

56637531990 is an abundant number, since it is smaller than the sum of its proper divisors (107369300538).

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

56637531990 is a wasteful number, since it uses less digits than its factorization.

56637531990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5378715 (or 5378706 counting only the distinct ones).

The product of its (nonzero) digits is 4592700, while the sum is 54.

The spelling of 56637531990 in words is "fifty-six billion, six hundred thirty-seven million, five hundred thirty-one thousand, nine hundred ninety".