51533691671 has 16 divisors (see below), whose sum is σ = 64885943808. Its totient is φ = 39758532000.

The previous prime is 51533691667. The next prime is 51533691673. The reversal of 51533691671 is 17619633515.

It is not a de Polignac number, because 51533691671 - 2² = 51533691667 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51533691673) 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, 3305435 + ... + 3320988.

It is an arithmetic number, because the mean of its divisors is an integer number (4055371488).

Almost surely, 2^51533691671 is an apocalyptic number.

51533691671 is a deficient number, since it is larger than the sum of its proper divisors (13352252137).

51533691671 is a wasteful number, since it uses less digits than its factorization.

51533691671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6626542.

The product of its digits is 510300, while the sum is 47.

The spelling of 51533691671 in words is "fifty-one billion, five hundred thirty-three million, six hundred ninety-one thousand, six hundred seventy-one".