56566321 has 4 divisors (see below), whose sum is σ = 64647232. Its totient is φ = 48485412.

The previous prime is 56566319. The next prime is 56566373. The reversal of 56566321 is 12366565.

56566321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56566321 - 2¹ = 56566319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56566621) by changing a digit.

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, 4040445 + ... + 4040458.

It is an arithmetic number, because the mean of its divisors is an integer number (16161808).

Almost surely, 2^56566321 is an apocalyptic number.

It is an amenable number.

56566321 is a deficient number, since it is larger than the sum of its proper divisors (8080911).

56566321 is an equidigital number, since it uses as much as digits as its factorization.

56566321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8080910.

The product of its digits is 32400, while the sum is 34.

The square root of 56566321 is about 7521.0585026311. The cubic root of 56566321 is about 383.8715956134.

The spelling of 56566321 in words is "fifty-six million, five hundred sixty-six thousand, three hundred twenty-one".