51686036831 has 16 divisors (see below), whose sum is σ = 60733800960. Its totient is φ = 43364509920.

The previous prime is 51686036791. The next prime is 51686036837. The reversal of 51686036831 is 13863068615.

51686036831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51686036831 - 2¹⁸ = 51685774687 is a prime.

It is a super-2 number, since 2×51686036831² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51686036837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 771950 + ... + 836228.

It is an arithmetic number, because the mean of its divisors is an integer number (3795862560).

Almost surely, 2^51686036831 is an apocalyptic number.

51686036831 is a deficient number, since it is larger than the sum of its proper divisors (9047764129).

51686036831 is a wasteful number, since it uses less digits than its factorization.

51686036831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69926.

The product of its (nonzero) digits is 622080, while the sum is 47.

The spelling of 51686036831 in words is "fifty-one billion, six hundred eighty-six million, thirty-six thousand, eight hundred thirty-one".