56637704661 has 32 divisors (see below), whose sum is σ = 79504008192. Its totient is φ = 35814804480.

The previous prime is 56637704623. The next prime is 56637704693. The reversal of 56637704661 is 16640773665.

It is a happy number.

It is not a de Polignac number, because 56637704661 - 2⁶ = 56637704597 is a prime.

It is a super-2 number, since 2×56637704661² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56637706661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5382141 + ... + 5392653.

It is an arithmetic number, because the mean of its divisors is an integer number (2484500256).

Almost surely, 2^56637704661 is an apocalyptic number.

It is an amenable number.

56637704661 is a deficient number, since it is larger than the sum of its proper divisors (22866303531).

56637704661 is a wasteful number, since it uses less digits than its factorization.

56637704661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11693.

The product of its (nonzero) digits is 3810240, while the sum is 51.

The spelling of 56637704661 in words is "fifty-six billion, six hundred thirty-seven million, seven hundred four thousand, six hundred sixty-one".