56115566565 has 16 divisors (see below), whose sum is σ = 90091346688. Its totient is φ = 29826155456.

The previous prime is 56115566557. The next prime is 56115566579. The reversal of 56115566565 is 56566551165.

It is a cyclic number.

It is not a de Polignac number, because 56115566565 - 2³ = 56115566557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6379629 + ... + 6388418.

It is an arithmetic number, because the mean of its divisors is an integer number (5630709168).

Almost surely, 2^56115566565 is an apocalyptic number.

It is an amenable number.

56115566565 is a deficient number, since it is larger than the sum of its proper divisors (33975780123).

56115566565 is a wasteful number, since it uses less digits than its factorization.

56115566565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12768348.

The product of its digits is 4050000, while the sum is 51.

The spelling of 56115566565 in words is "fifty-six billion, one hundred fifteen million, five hundred sixty-six thousand, five hundred sixty-five".