56815825921 has 8 divisors (see below), whose sum is σ = 56950951680. Its totient is φ = 56680754592.

The previous prime is 56815825901. The next prime is 56815825933. The reversal of 56815825921 is 12952851865.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56815825921 - 2⁷ = 56815825793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56815825901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2711541 + ... + 2732413.

It is an arithmetic number, because the mean of its divisors is an integer number (7118868960).

Almost surely, 2^56815825921 is an apocalyptic number.

It is an amenable number.

56815825921 is a deficient number, since it is larger than the sum of its proper divisors (135125759).

56815825921 is a wasteful number, since it uses less digits than its factorization.

56815825921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27215.

The product of its digits is 1728000, while the sum is 52.

The spelling of 56815825921 in words is "fifty-six billion, eight hundred fifteen million, eight hundred twenty-five thousand, nine hundred twenty-one".