56691819665 has 16 divisors (see below), whose sum is σ = 73362475200. Its totient is φ = 41808042432.

The previous prime is 56691819659. The next prime is 56691819683.

56691819665 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 56691819665 - 2²⁸ = 56423384209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56691819598 and 56691819607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 542075 + ... + 638144.

It is an arithmetic number, because the mean of its divisors is an integer number (4585154700).

Almost surely, 2^56691819665 is an apocalyptic number.

It is an amenable number.

56691819665 is a deficient number, since it is larger than the sum of its proper divisors (16670655535).

56691819665 is a wasteful number, since it uses less digits than its factorization.

56691819665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180976.

The product of its digits is 20995200, while the sum is 62.

The spelling of 56691819665 in words is "fifty-six billion, six hundred ninety-one million, eight hundred nineteen thousand, six hundred sixty-five".