12886638681 has 32 divisors (see below), whose sum is σ = 20145807360. Its totient is φ = 7175343744.

The previous prime is 12886638649. The next prime is 12886638727. The reversal of 12886638681 is 18683668821.

It is a happy number.

It is not a de Polignac number, because 12886638681 - 2⁵ = 12886638649 is a prime.

It is a super-2 number, since 2×12886638681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12886638601) 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, 76600 + ... + 177878.

It is an arithmetic number, because the mean of its divisors is an integer number (629556480).

Almost surely, 2^12886638681 is an apocalyptic number.

It is an amenable number.

12886638681 is a deficient number, since it is larger than the sum of its proper divisors (7259168679).

12886638681 is a wasteful number, since it uses less digits than its factorization.

12886638681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101445.

The product of its digits is 5308416, while the sum is 57.

The spelling of 12886638681 in words is "twelve billion, eight hundred eighty-six million, six hundred thirty-eight thousand, six hundred eighty-one".