12665311525 has 24 divisors (see below), whose sum is σ = 16635736584. Its totient is φ = 9532262400.

The previous prime is 12665311487. The next prime is 12665311531. The reversal of 12665311525 is 52511356621.

It is a happy number.

12665311525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 164506276 + 12500805249 = 12826^2 + 111807^2 .

It is not a de Polignac number, because 12665311525 - 2²⁹ = 12128440613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1377945 + ... + 1387105.

It is an arithmetic number, because the mean of its divisors is an integer number (693155691).

Almost surely, 2^12665311525 is an apocalyptic number.

It is an amenable number.

12665311525 is a deficient number, since it is larger than the sum of its proper divisors (3970425059).

12665311525 is a wasteful number, since it uses less digits than its factorization.

12665311525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12441 (or 12436 counting only the distinct ones).

The product of its digits is 54000, while the sum is 37.

The spelling of 12665311525 in words is "twelve billion, six hundred sixty-five million, three hundred eleven thousand, five hundred twenty-five".