56663636665 has 4 divisors (see below), whose sum is σ = 67996364004. Its totient is φ = 45330909328.

The previous prime is 56663636629. The next prime is 56663636681.

It is a happy number.

56663636665 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36565470841 + 20098165824 = 191221^2 + 141768^2 .

It is a cyclic number.

It is not a de Polignac number, because 56663636665 - 2⁷ = 56663636537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5666363662 + ... + 5666363671.

It is an arithmetic number, because the mean of its divisors is an integer number (16999091001).

Almost surely, 2^56663636665 is an apocalyptic number.

It is an amenable number.

56663636665 is a deficient number, since it is larger than the sum of its proper divisors (11332727339).

56663636665 is a wasteful number, since it uses less digits than its factorization.

56663636665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11332727338.

The product of its digits is 62985600, while the sum is 58.

The spelling of 56663636665 in words is "fifty-six billion, six hundred sixty-three million, six hundred thirty-six thousand, six hundred sixty-five".