55956813987 has 16 divisors (see below), whose sum is σ = 79345535360. Its totient is φ = 34976800512.

The previous prime is 55956813943. The next prime is 55956814013. The reversal of 55956813987 is 78931865955.

It is not a de Polignac number, because 55956813987 - 2¹⁰ = 55956812963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55956813907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5054773 + ... + 5065830.

It is an arithmetic number, because the mean of its divisors is an integer number (4959095960).

Almost surely, 2^55956813987 is an apocalyptic number.

55956813987 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

55956813987 is a deficient number, since it is larger than the sum of its proper divisors (23388721373).

55956813987 is a wasteful number, since it uses less digits than its factorization.

55956813987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10120722.

The product of its digits is 81648000, while the sum is 66.

The spelling of 55956813987 in words is "fifty-five billion, nine hundred fifty-six million, eight hundred thirteen thousand, nine hundred eighty-seven".