56256938721 has 32 divisors (see below), whose sum is σ = 85470528000. Its totient is φ = 36554146560.

The previous prime is 56256938719. The next prime is 56256938761. The reversal of 56256938721 is 12783965265.

56256938721 is a `hidden beast` number, since 5 + 6 + 2 + 569 + 3 + 8 + 72 + 1 = 666.

It is not a de Polignac number, because 56256938721 - 2¹ = 56256938719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56256938761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 213855 + ... + 397803.

It is an arithmetic number, because the mean of its divisors is an integer number (2670954000).

Almost surely, 2^56256938721 is an apocalyptic number.

It is an amenable number.

56256938721 is a deficient number, since it is larger than the sum of its proper divisors (29213589279).

56256938721 is a wasteful number, since it uses less digits than its factorization.

56256938721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184246 (or 184240 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 56256938721 in words is "fifty-six billion, two hundred fifty-six million, nine hundred thirty-eight thousand, seven hundred twenty-one".