56505560055551 has 16 divisors (see below), whose sum is σ = 59701399680000. Its totient is φ = 53331922476000.

The previous prime is 56505560055499. The next prime is 56505560055619. The reversal of 56505560055551 is 15555006550565.

It is a cyclic number.

It is not a de Polignac number, because 56505560055551 - 2²⁶ = 56505492946687 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 56505560055493 and 56505560055502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56505560055251) 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, 137277950 + ... + 137688948.

It is an arithmetic number, because the mean of its divisors is an integer number (3731337480000).

Almost surely, 2^{56505560055551} is an apocalyptic number.

56505560055551 is a deficient number, since it is larger than the sum of its proper divisors (3195839624449).

56505560055551 is a wasteful number, since it uses less digits than its factorization.

56505560055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437990.

The product of its (nonzero) digits is 14062500, while the sum is 53.

The spelling of 56505560055551 in words is "fifty-six trillion, five hundred five billion, five hundred sixty million, fifty-five thousand, five hundred fifty-one".