51564133660 has 48 divisors (see below), whose sum is σ = 116638685856. Its totient is φ = 19035078912.

The previous prime is 51564133609. The next prime is 51564133693. The reversal of 51564133660 is 6633146515.

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, 1413814 + ... + 1449826.

It is an arithmetic number, because the mean of its divisors is an integer number (2429972622).

Almost surely, 2^51564133660 is an apocalyptic number.

It is an amenable number.

51564133660 is an abundant number, since it is smaller than the sum of its proper divisors (65074552196).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51564133660 is a wasteful number, since it uses less digits than its factorization.

51564133660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41542 (or 41540 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 51564133660 in words is "fifty-one billion, five hundred sixty-four million, one hundred thirty-three thousand, six hundred sixty".