51731553878766 has 96 divisors (see below), whose sum is σ = 113044526899200. Its totient is φ = 17096884680960.

The previous prime is 51731553878761. The next prime is 51731553878773. The reversal of 51731553878766 is 66787835513715.

51731553878766 is a `hidden beast` number, since 5 + 1 + 7 + 3 + 1 + 5 + 538 + 7 + 87 + 6 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 51731553878694 and 51731553878703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51731553878761) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2627691375 + ... + 2627711061.

It is an arithmetic number, because the mean of its divisors is an integer number (1177547155200).

Almost surely, 2^{51731553878766} is an apocalyptic number.

51731553878766 is an abundant number, since it is smaller than the sum of its proper divisors (61312973020434).

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

51731553878766 is a wasteful number, since it uses less digits than its factorization.

51731553878766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22374 (or 22371 counting only the distinct ones).

The product of its digits is 889056000, while the sum is 72.

The spelling of 51731553878766 in words is "fifty-one trillion, seven hundred thirty-one billion, five hundred fifty-three million, eight hundred seventy-eight thousand, seven hundred sixty-six".