51756635868 has 48 divisors (see below), whose sum is σ = 144018470400. Its totient is φ = 14144670144.

The previous prime is 51756635851. The next prime is 51756635899. The reversal of 51756635868 is 86853665715.

It is a super-2 number, since 2×51756635868² (a number of 22 digits) contains 22 as substring.

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, 13392643 + ... + 13396506.

It is an arithmetic number, because the mean of its divisors is an integer number (3000384800).

Almost surely, 2^51756635868 is an apocalyptic number.

It is an amenable number.

51756635868 is an abundant number, since it is smaller than the sum of its proper divisors (92261834532).

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

51756635868 is a wasteful number, since it uses less digits than its factorization.

51756635868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26789186 (or 26789184 counting only the distinct ones).

The product of its digits is 36288000, while the sum is 60.

The spelling of 51756635868 in words is "fifty-one billion, seven hundred fifty-six million, six hundred thirty-five thousand, eight hundred sixty-eight".