51718364664 has 32 divisors (see below), whose sum is σ = 133466749440. Its totient is φ = 16683343200.

The previous prime is 51718364611. The next prime is 51718364671. The reversal of 51718364664 is 46646381715.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34756222 + ... + 34757709.

It is an arithmetic number, because the mean of its divisors is an integer number (4170835920).

Almost surely, 2^51718364664 is an apocalyptic number.

It is an amenable number.

51718364664 is an abundant number, since it is smaller than the sum of its proper divisors (81748384776).

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

51718364664 is a wasteful number, since it uses less digits than its factorization.

51718364664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69513971 (or 69513967 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 51.

The spelling of 51718364664 in words is "fifty-one billion, seven hundred eighteen million, three hundred sixty-four thousand, six hundred sixty-four".