56715220171521 has 12 divisors (see below), whose sum is σ = 81999931408720. Its totient is φ = 37774171373400.

The previous prime is 56715220171459. The next prime is 56715220171537. The reversal of 56715220171521 is 12517102251765.

56715220171521 is a `hidden beast` number, since 5 + 6 + 7 + 1 + 52 + 2 + 0 + 1 + 71 + 521 = 666.

It is not a de Polignac number, because 56715220171521 - 2³⁹ = 56165464357633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56715220171021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2997940651 + ... + 2997959568.

Almost surely, 2^{56715220171521} is an apocalyptic number.

It is an amenable number.

56715220171521 is a deficient number, since it is larger than the sum of its proper divisors (25284711237199).

56715220171521 is a wasteful number, since it uses less digits than its factorization.

56715220171521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5995901276 (or 5995901273 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 45.

The spelling of 56715220171521 in words is "fifty-six trillion, seven hundred fifteen billion, two hundred twenty million, one hundred seventy-one thousand, five hundred twenty-one".