12681138185725 has 12 divisors (see below), whose sum is σ = 15799135581280. Its totient is φ = 10096830399600.

The previous prime is 12681138185687. The next prime is 12681138185741. The reversal of 12681138185725 is 52758183118621.

It is a de Polignac number, because none of the positive numbers 2^k-12681138185725 is a prime.

It is a super-2 number, since 2×12681138185725² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12681138185725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1201998345 + ... + 1202008894.

Almost surely, 2^{12681138185725} is an apocalyptic number.

It is an amenable number.

12681138185725 is a deficient number, since it is larger than the sum of its proper divisors (3117997395555).

12681138185725 is a wasteful number, since it uses less digits than its factorization.

12681138185725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404007460 (or 2404007455 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 58.

The spelling of 12681138185725 in words is "twelve trillion, six hundred eighty-one billion, one hundred thirty-eight million, one hundred eighty-five thousand, seven hundred twenty-five".