56991922919964 has 72 divisors (see below), whose sum is σ = 145158234443040. Its totient is φ = 18852953720832.

The previous prime is 56991922919963. The next prime is 56991922919983. The reversal of 56991922919964 is 46991922919965.

56991922919964 is a `hidden beast` number, since 5 + 69 + 91 + 9 + 229 + 199 + 64 = 666.

It is a super-2 number, since 2×56991922919964² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56991922919963) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14628492 + ... + 18110124.

Almost surely, 2^{56991922919964} is an apocalyptic number.

It is an amenable number.

56991922919964 is an abundant number, since it is smaller than the sum of its proper divisors (88166311523076).

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

56991922919964 is a wasteful number, since it uses less digits than its factorization.

56991922919964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485099 (or 3485094 counting only the distinct ones).

The product of its digits is 1530550080, while the sum is 81.

Subtracting from 56991922919964 its reverse (46991922919965), we obtain a palindrome (9999999999999).

The spelling of 56991922919964 in words is "fifty-six trillion, nine hundred ninety-one billion, nine hundred twenty-two million, nine hundred nineteen thousand, nine hundred sixty-four".