56396665321 has 16 divisors (see below), whose sum is σ = 59021706240. Its totient is φ = 53786267920.

The previous prime is 56396665319. The next prime is 56396665331. The reversal of 56396665321 is 12356669365.

It is a cyclic number.

It is not a de Polignac number, because 56396665321 - 2¹ = 56396665319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56396665331) 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, 18728706 + ... + 18731716.

It is an arithmetic number, because the mean of its divisors is an integer number (3688856640).

Almost surely, 2^56396665321 is an apocalyptic number.

It is an amenable number.

56396665321 is a deficient number, since it is larger than the sum of its proper divisors (2625040919).

56396665321 is a wasteful number, since it uses less digits than its factorization.

56396665321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5156.

The product of its digits is 5248800, while the sum is 52.

The spelling of 56396665321 in words is "fifty-six billion, three hundred ninety-six million, six hundred sixty-five thousand, three hundred twenty-one".