56661638384 has 80 divisors (see below), whose sum is σ = 128564771328. Its totient is φ = 23947923456.

The previous prime is 56661638377. The next prime is 56661638393. The reversal of 56661638384 is 48383616665.

It is a congruent number.

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, 85712 + ... + 347375.

Almost surely, 2^56661638384 is an apocalyptic number.

It is an amenable number.

56661638384 is an abundant number, since it is smaller than the sum of its proper divisors (71903132944).

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

56661638384 is a wasteful number, since it uses less digits than its factorization.

56661638384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433162 (or 433156 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 56.

The spelling of 56661638384 in words is "fifty-six billion, six hundred sixty-one million, six hundred thirty-eight thousand, three hundred eighty-four".