56521521365 has 16 divisors (see below), whose sum is σ = 68157303552. Its totient is φ = 44996766144.

The previous prime is 56521521349. The next prime is 56521521377. The reversal of 56521521365 is 56312512565.

It is a cyclic number.

It is not a de Polignac number, because 56521521365 - 2⁴ = 56521521349 is a prime.

It is a Duffinian number.

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, 823967 + ... + 889923.

It is an arithmetic number, because the mean of its divisors is an integer number (4259831472).

Almost surely, 2^56521521365 is an apocalyptic number.

It is an amenable number.

56521521365 is a deficient number, since it is larger than the sum of its proper divisors (11635782187).

56521521365 is a wasteful number, since it uses less digits than its factorization.

56521521365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66796.

The product of its digits is 270000, while the sum is 41.

The spelling of 56521521365 in words is "fifty-six billion, five hundred twenty-one million, five hundred twenty-one thousand, three hundred sixty-five".