51656737274407 has 32 divisors (see below), whose sum is σ = 53507543100480. Its totient is φ = 49837068288000.

The previous prime is 51656737274383. The next prime is 51656737274423. The reversal of 51656737274407 is 70447273765615.

It is a cyclic number.

It is not a de Polignac number, because 51656737274407 - 2³⁵ = 51622377536039 is a prime.

It is a Smith number, since the sum of its digits (64) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656737274507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5978092807 + ... + 5978101447.

It is an arithmetic number, because the mean of its divisors is an integer number (1672110721890).

Almost surely, 2^{51656737274407} is an apocalyptic number.

51656737274407 is a deficient number, since it is larger than the sum of its proper divisors (1850805826073).

51656737274407 is a wasteful number, since it uses less digits than its factorization.

51656737274407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12835.

The product of its (nonzero) digits is 207446400, while the sum is 64.

The spelling of 51656737274407 in words is "fifty-one trillion, six hundred fifty-six billion, seven hundred thirty-seven million, two hundred seventy-four thousand, four hundred seven".