56510939565 has 24 divisors (see below), whose sum is σ = 99612508320. Its totient is φ = 29628333024.

The previous prime is 56510939557. The next prime is 56510939591. The reversal of 56510939565 is 56593901565.

56510939565 is a `hidden beast` number, since 5 + 65 + 10 + 9 + 3 + 9 + 565 = 666.

It is not a de Polignac number, because 56510939565 - 2³ = 56510939557 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10639707 + ... + 10645016.

It is an arithmetic number, because the mean of its divisors is an integer number (4150521180).

Almost surely, 2^56510939565 is an apocalyptic number.

It is an amenable number.

56510939565 is a deficient number, since it is larger than the sum of its proper divisors (43101568755).

56510939565 is a wasteful number, since it uses less digits than its factorization.

56510939565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21284793 (or 21284790 counting only the distinct ones).

The product of its (nonzero) digits is 5467500, while the sum is 54.

The spelling of 56510939565 in words is "fifty-six billion, five hundred ten million, nine hundred thirty-nine thousand, five hundred sixty-five".