51516116664 has 32 divisors (see below), whose sum is σ = 133231338000. Its totient is φ = 16579899392.

The previous prime is 51516116647. The next prime is 51516116671. The reversal of 51516116664 is 46661161515.

It is a super-2 number, since 2×51516116664² (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 7 ways as a sum of consecutive naturals, for example, 37008009 + ... + 37009400.

Almost surely, 2^51516116664 is an apocalyptic number.

It is an amenable number.

51516116664 is an abundant number, since it is smaller than the sum of its proper divisors (81715221336).

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

51516116664 is a wasteful number, since it uses less digits than its factorization.

51516116664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74017447 (or 74017443 counting only the distinct ones).

The product of its digits is 129600, while the sum is 42.

The spelling of 51516116664 in words is "fifty-one billion, five hundred sixteen million, one hundred sixteen thousand, six hundred sixty-four".