56640340565 has 4 divisors (see below), whose sum is σ = 67968408684. Its totient is φ = 45312272448.

The previous prime is 56640340541. The next prime is 56640340579. The reversal of 56640340565 is 56504304665.

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 7919932036 + 48720408529 = 88994^2 + 220727^2 .

It is a cyclic number.

It is not a de Polignac number, because 56640340565 - 2³⁴ = 39460471381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5664034052 + ... + 5664034061.

It is an arithmetic number, because the mean of its divisors is an integer number (16992102171).

Almost surely, 2^56640340565 is an apocalyptic number.

It is an amenable number.

56640340565 is a deficient number, since it is larger than the sum of its proper divisors (11328068119).

56640340565 is a wasteful number, since it uses less digits than its factorization.

56640340565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11328068118.

The product of its (nonzero) digits is 1296000, while the sum is 44.

The spelling of 56640340565 in words is "fifty-six billion, six hundred forty million, three hundred forty thousand, five hundred sixty-five".