55556172839 has 4 divisors (see below), whose sum is σ = 58824183024. Its totient is φ = 52288162656.

The previous prime is 55556172781. The next prime is 55556172851. The reversal of 55556172839 is 93827165555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55556172839 - 2²⁰ = 55555124263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55556172439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1634005067 + ... + 1634005100.

It is an arithmetic number, because the mean of its divisors is an integer number (14706045756).

Almost surely, 2^55556172839 is an apocalyptic number.

55556172839 is a deficient number, since it is larger than the sum of its proper divisors (3268010185).

55556172839 is a wasteful number, since it uses less digits than its factorization.

55556172839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3268010184.

The product of its digits is 11340000, while the sum is 56.

The spelling of 55556172839 in words is "fifty-five billion, five hundred fifty-six million, one hundred seventy-two thousand, eight hundred thirty-nine".