55866522321 has 9 divisors (see below), whose sum is σ = 80697112041. Its totient is φ = 37243875492.

The previous prime is 55866522281. The next prime is 55866522337. The reversal of 55866522321 is 12322566855.

The square root of 55866522321 is 236361.

It is a perfect power (a square), and thus also a powerful number.

55866522321 is a `hidden beast` number, since 5 + 586 + 65 + 2 + 2 + 3 + 2 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is a de Polignac number, because none of the positive numbers 2^k-55866522321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55866522421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 669690 + ... + 748476.

Almost surely, 2^55866522321 is an apocalyptic number.

55866522321 is the 236361-st square number.

55866522321 is the 118181-st centered octagonal number.

It is an amenable number.

55866522321 is a deficient number, since it is larger than the sum of its proper divisors (24830589720).

55866522321 is an frugal number, since it uses more digits than its factorization.

55866522321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157580 (or 78790 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The spelling of 55866522321 in words is "fifty-five billion, eight hundred sixty-six million, five hundred twenty-two thousand, three hundred twenty-one".