51685735169 has 16 divisors (see below), whose sum is σ = 54540007680. Its totient is φ = 48845028240.

The previous prime is 51685735159. The next prime is 51685735181. The reversal of 51685735169 is 96153758615.

It is a de Polignac number, because none of the positive numbers 2^k-51685735169 is a prime.

It is a super-2 number, since 2×51685735169² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51685735109) 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, 23460422 + ... + 23462624.

It is an arithmetic number, because the mean of its divisors is an integer number (3408750480).

Almost surely, 2^51685735169 is an apocalyptic number.

It is an amenable number.

51685735169 is a deficient number, since it is larger than the sum of its proper divisors (2854272511).

51685735169 is a wasteful number, since it uses less digits than its factorization.

51685735169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4700.

The product of its digits is 6804000, while the sum is 56.

The spelling of 51685735169 in words is "fifty-one billion, six hundred eighty-five million, seven hundred thirty-five thousand, one hundred sixty-nine".