51697569879 has 6 divisors (see below), whose sum is σ = 74674267616. Its totient is φ = 34465046580.

The previous prime is 51697569839. The next prime is 51697569887. The reversal of 51697569879 is 97896579615.

51697569879 is a `hidden beast` number, since 51 + 6 + 9 + 7 + 569 + 8 + 7 + 9 = 666.

It is not a de Polignac number, because 51697569879 - 2⁹ = 51697569367 is a prime.

It is a super-3 number, since 3×51697569879³ (a number of 33 digits) contains 333 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 (51697569839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2872087207 + ... + 2872087224.

Almost surely, 2^51697569879 is an apocalyptic number.

51697569879 is a deficient number, since it is larger than the sum of its proper divisors (22976697737).

51697569879 is a wasteful number, since it uses less digits than its factorization.

51697569879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5744174437 (or 5744174434 counting only the distinct ones).

The product of its digits is 257191200, while the sum is 72.

The spelling of 51697569879 in words is "fifty-one billion, six hundred ninety-seven million, five hundred sixty-nine thousand, eight hundred seventy-nine".