56687185638 has 20 divisors (see below), whose sum is σ = 127021286700. Its totient is φ = 18895728492.

The previous prime is 56687185619. The next prime is 56687185721. The reversal of 56687185638 is 83658178665.

It is a happy number.

56687185638 is a `hidden beast` number, since 5 + 6 + 68 + 7 + 1 + 8 + 563 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 174960288 + ... + 174960611.

It is an arithmetic number, because the mean of its divisors is an integer number (6351064335).

Almost surely, 2^56687185638 is an apocalyptic number.

56687185638 is an abundant number, since it is smaller than the sum of its proper divisors (70334101062).

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

56687185638 is a wasteful number, since it uses less digits than its factorization.

56687185638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349920913 (or 349920904 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 63.

The spelling of 56687185638 in words is "fifty-six billion, six hundred eighty-seven million, one hundred eighty-five thousand, six hundred thirty-eight".