56109402566 has 32 divisors (see below), whose sum is σ = 100385353728. Its totient is φ = 22997763360.

The previous prime is 56109402527. The next prime is 56109402631. The reversal of 56109402566 is 66520490165.

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, 3256811 + ... + 3273993.

It is an arithmetic number, because the mean of its divisors is an integer number (3137042304).

Almost surely, 2^56109402566 is an apocalyptic number.

56109402566 is a deficient number, since it is larger than the sum of its proper divisors (44275951162).

56109402566 is a wasteful number, since it uses less digits than its factorization.

56109402566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27356.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 56109402566 in words is "fifty-six billion, one hundred nine million, four hundred two thousand, five hundred sixty-six".