53356564521 has 12 divisors (see below), whose sum is σ = 82999100548. Its totient is φ = 32834808864.

The previous prime is 53356564447. The next prime is 53356564537. The reversal of 53356564521 is 12546565335.

53356564521 is a `hidden beast` number, since 5 + 3 + 3 + 5 + 65 + 64 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5474372121 + 47882192400 = 73989^2 + 218820^2 .

It is not a de Polignac number, because 53356564521 - 2¹¹ = 53356562473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53356564561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228019390 + ... + 228019623.

Almost surely, 2^53356564521 is an apocalyptic number.

It is an amenable number.

53356564521 is a deficient number, since it is larger than the sum of its proper divisors (29642536027).

53356564521 is a wasteful number, since it uses less digits than its factorization.

53356564521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456039032 (or 456039029 counting only the distinct ones).

The product of its digits is 1620000, while the sum is 45.

The spelling of 53356564521 in words is "fifty-three billion, three hundred fifty-six million, five hundred sixty-four thousand, five hundred twenty-one".