55657121156 has 24 divisors (see below), whose sum is σ = 119876877120. Its totient is φ = 22018201632.

The previous prime is 55657121147. The next prime is 55657121161. The reversal of 55657121156 is 65112175655.

It is an unprimeable number.

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, 76451726 + ... + 76452453.

It is an arithmetic number, because the mean of its divisors is an integer number (4994869880).

Almost surely, 2^55657121156 is an apocalyptic number.

It is an amenable number.

55657121156 is an abundant number, since it is smaller than the sum of its proper divisors (64219755964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55657121156 is a wasteful number, since it uses less digits than its factorization.

55657121156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152904203 (or 152904201 counting only the distinct ones).

The product of its digits is 315000, while the sum is 44.

The spelling of 55657121156 in words is "fifty-five billion, six hundred fifty-seven million, one hundred twenty-one thousand, one hundred fifty-six".