51171535613 has 24 divisors (see below), whose sum is σ = 57218004480. Its totient is φ = 45717328800.

The previous prime is 51171535589. The next prime is 51171535631. The reversal of 51171535613 is 31653517115.

It is not a de Polignac number, because 51171535613 - 2¹⁸ = 51171273469 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 (51171535673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11504756 + ... + 11509202.

It is an arithmetic number, because the mean of its divisors is an integer number (2384083520).

Almost surely, 2^51171535613 is an apocalyptic number.

It is an amenable number.

51171535613 is a deficient number, since it is larger than the sum of its proper divisors (6046468867).

51171535613 is a wasteful number, since it uses less digits than its factorization.

51171535613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6089 (or 6078 counting only the distinct ones).

The product of its digits is 47250, while the sum is 38.

The spelling of 51171535613 in words is "fifty-one billion, one hundred seventy-one million, five hundred thirty-five thousand, six hundred thirteen".