55657121165 has 32 divisors (see below), whose sum is σ = 69404366592. Its totient is φ = 42815808000.

The previous prime is 55657121161. The next prime is 55657121171. The reversal of 55657121165 is 56112175655.

It is not a de Polignac number, because 55657121165 - 2² = 55657121161 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55657121161) 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 31 ways as a sum of consecutive naturals, for example, 12530345 + ... + 12534785.

It is an arithmetic number, because the mean of its divisors is an integer number (2168886456).

Almost surely, 2^55657121165 is an apocalyptic number.

It is an amenable number.

55657121165 is a deficient number, since it is larger than the sum of its proper divisors (13747245427).

55657121165 is a wasteful number, since it uses less digits than its factorization.

55657121165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5381.

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

The spelling of 55657121165 in words is "fifty-five billion, six hundred fifty-seven million, one hundred twenty-one thousand, one hundred sixty-five".