56561115555 has 48 divisors (see below), whose sum is σ = 115908511680. Its totient is φ = 24964902144.

The previous prime is 56561115511. The next prime is 56561115607. The reversal of 56561115555 is 55551116565.

It is not a de Polignac number, because 56561115555 - 2⁶ = 56561115491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 56561115555.

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 47 ways as a sum of consecutive naturals, for example, 3086712 + ... + 3104981.

It is an arithmetic number, because the mean of its divisors is an integer number (2414760660).

Almost surely, 2^56561115555 is an apocalyptic number.

56561115555 is an abundant number, since it is smaller than the sum of its proper divisors (59347396125).

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

56561115555 is a wasteful number, since it uses less digits than its factorization.

56561115555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6191740 (or 6191737 counting only the distinct ones).

The product of its digits is 562500, while the sum is 45.

It can be divided in two parts, 5656 and 1115555, that added together give a palindrome (1121211).

The spelling of 56561115555 in words is "fifty-six billion, five hundred sixty-one million, one hundred fifteen thousand, five hundred fifty-five".