51656758447797 has 6 divisors (see below), whose sum is σ = 74615317757942. Its totient is φ = 34437838965192.

The previous prime is 51656758447751. The next prime is 51656758447813. The reversal of 51656758447797 is 79774485765615.

51656758447797 is a `hidden beast` number, since 5 + 1 + 6 + 5 + 6 + 7 + 58 + 4 + 477 + 97 = 666.

It can be written as a sum of positive squares in only one way, i.e., 42551277181956 + 9105481265841 = 6523134^2 + 3017529^2 .

It is not a de Polignac number, because 51656758447797 - 2¹⁰ = 51656758446773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656758447747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2869819913758 + ... + 2869819913775.

Almost surely, 2^{51656758447797} is an apocalyptic number.

It is an amenable number.

51656758447797 is a deficient number, since it is larger than the sum of its proper divisors (22958559310145).

51656758447797 is a wasteful number, since it uses less digits than its factorization.

51656758447797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5739639827539 (or 5739639827536 counting only the distinct ones).

The product of its digits is 12446784000, while the sum is 81.

The spelling of 51656758447797 in words is "fifty-one trillion, six hundred fifty-six billion, seven hundred fifty-eight million, four hundred forty-seven thousand, seven hundred ninety-seven".