56917755878784 has 128 divisors (see below), whose sum is σ = 159983161274880. Its totient is φ = 17892088811520.

The previous prime is 56917755878743. The next prime is 56917755878833. The reversal of 56917755878784 is 48787855771965.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 56917755878784.

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, 44756677 + ... + 46010820.

It is an arithmetic number, because the mean of its divisors is an integer number (1249868447460).

Almost surely, 2^{56917755878784} is an apocalyptic number.

It is an amenable number.

56917755878784 is an abundant number, since it is smaller than the sum of its proper divisors (103065405396096).

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

56917755878784 is a wasteful number, since it uses less digits than its factorization.

56917755878784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90767608 (or 90767596 counting only the distinct ones).

The product of its digits is 33191424000, while the sum is 87.

The spelling of 56917755878784 in words is "fifty-six trillion, nine hundred seventeen billion, seven hundred fifty-five million, eight hundred seventy-eight thousand, seven hundred eighty-four".