56655999990 has 80 divisors (see below), whose sum is σ = 152382428352. Its totient is φ = 15104226816.

The previous prime is 56655999971. The next prime is 56656000007. The reversal of 56655999990 is 9999955665.

56655999990 is a `hidden beast` number, since 5 + 66 + 559 + 9 + 9 + 9 + 9 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4178502 + ... + 4192038.

Almost surely, 2^56655999990 is an apocalyptic number.

56655999990 is an abundant number, since it is smaller than the sum of its proper divisors (95726428362).

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

56655999990 is a wasteful number, since it uses less digits than its factorization.

56655999990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18723 (or 18714 counting only the distinct ones).

The product of its (nonzero) digits is 265720500, while the sum is 72.

The spelling of 56655999990 in words is "fifty-six billion, six hundred fifty-five million, nine hundred ninety-nine thousand, nine hundred ninety".