56510156521 has 16 divisors (see below), whose sum is σ = 72574919424. Its totient is φ = 42767360064.

The previous prime is 56510156513. The next prime is 56510156539. The reversal of 56510156521 is 12565101565.

It is not a de Polignac number, because 56510156521 - 2³ = 56510156513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56510159521) 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, 13497706 + ... + 13501891.

It is an arithmetic number, because the mean of its divisors is an integer number (4535932464).

Almost surely, 2^56510156521 is an apocalyptic number.

It is an amenable number.

56510156521 is a deficient number, since it is larger than the sum of its proper divisors (16064762903).

56510156521 is a wasteful number, since it uses less digits than its factorization.

56510156521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26999640.

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 56510156521 in words is "fifty-six billion, five hundred ten million, one hundred fifty-six thousand, five hundred twenty-one".