51756688731 has 32 divisors (see below), whose sum is σ = 79499796480. Its totient is φ = 29621095200.

The previous prime is 51756688691. The next prime is 51756688757. The reversal of 51756688731 is 13788665715.

It is not a de Polignac number, because 51756688731 - 2¹⁰ = 51756687707 is a prime.

It is a super-2 number, since 2×51756688731² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (51756688771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62286 + ... + 327708.

It is an arithmetic number, because the mean of its divisors is an integer number (2484368640).

Almost surely, 2^51756688731 is an apocalyptic number.

51756688731 is a deficient number, since it is larger than the sum of its proper divisors (27743107749).

51756688731 is a wasteful number, since it uses less digits than its factorization.

51756688731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265767.

The product of its digits is 8467200, while the sum is 57.

The spelling of 51756688731 in words is "fifty-one billion, seven hundred fifty-six million, six hundred eighty-eight thousand, seven hundred thirty-one".