56168780637681 has 16 divisors (see below), whose sum is σ = 83215415500800. Its totient is φ = 37444770541584.

The previous prime is 56168780637679. The next prime is 56168780637793. The reversal of 56168780637681 is 18673608786165.

56168780637681 is a `hidden beast` number, since 56 + 1 + 68 + 78 + 0 + 6 + 376 + 81 = 666.

It is not a de Polignac number, because 56168780637681 - 2¹ = 56168780637679 is a prime.

It is a super-2 number, since 2×56168780637681² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56168780637611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29138161 + ... + 31005966.

It is an arithmetic number, because the mean of its divisors is an integer number (5200963468800).

Almost surely, 2^{56168780637681} is an apocalyptic number.

It is an amenable number.

56168780637681 is a deficient number, since it is larger than the sum of its proper divisors (27046634863119).

56168780637681 is a wasteful number, since it uses less digits than its factorization.

56168780637681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60178725 (or 60178719 counting only the distinct ones).

The product of its (nonzero) digits is 487710720, while the sum is 72.

The spelling of 56168780637681 in words is "fifty-six trillion, one hundred sixty-eight billion, seven hundred eighty million, six hundred thirty-seven thousand, six hundred eighty-one".