51331697751 has 32 divisors (see below), whose sum is σ = 69735333888. Its totient is φ = 33581639520.

The previous prime is 51331697743. The next prime is 51331697803. The reversal of 51331697751 is 15779613315.

It is not a de Polignac number, because 51331697751 - 2³ = 51331697743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51331697751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51331697951) 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, 45708876 + ... + 45709998.

It is an arithmetic number, because the mean of its divisors is an integer number (2179229184).

Almost surely, 2^51331697751 is an apocalyptic number.

51331697751 is a deficient number, since it is larger than the sum of its proper divisors (18403636137).

51331697751 is a wasteful number, since it uses less digits than its factorization.

51331697751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451.

The product of its digits is 595350, while the sum is 48.

The spelling of 51331697751 in words is "fifty-one billion, three hundred thirty-one million, six hundred ninety-seven thousand, seven hundred fifty-one".