57977665656 has 64 divisors (see below), whose sum is σ = 151762705920. Its totient is φ = 18422490240.

The previous prime is 57977665643. The next prime is 57977665663. The reversal of 57977665656 is 65656677975.

It is a super-2 number, since 2×57977665656² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (69).

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, 17500 + ... + 340971.

It is an arithmetic number, because the mean of its divisors is an integer number (2371292280).

Almost surely, 2^57977665656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57977665656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75881352960).

57977665656 is an abundant number, since it is smaller than the sum of its proper divisors (93785040264).

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

57977665656 is a wasteful number, since it uses less digits than its factorization.

57977665656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358796 (or 358792 counting only the distinct ones).

The product of its digits is 500094000, while the sum is 69.

The spelling of 57977665656 in words is "fifty-seven billion, nine hundred seventy-seven million, six hundred sixty-five thousand, six hundred fifty-six".