12591638372 has 12 divisors (see below), whose sum is σ = 22036198716. Its totient is φ = 6295581600.

The previous prime is 12591638369. The next prime is 12591638377. The reversal of 12591638372 is 27383619521.

12591638372 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 2 ways, for example, as 2273954596 + 10317683776 = 47686^2 + 101576^2 .

It is not an unprimeable number, because it can be changed into a prime (12591638377) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 120158 + ... + 199050.

It is an arithmetic number, because the mean of its divisors is an integer number (1836349893).

Almost surely, 2^12591638372 is an apocalyptic number.

It is an amenable number.

12591638372 is a deficient number, since it is larger than the sum of its proper divisors (9444560344).

12591638372 is a wasteful number, since it uses less digits than its factorization.

12591638372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118798 (or 118796 counting only the distinct ones).

The product of its digits is 544320, while the sum is 47.

The spelling of 12591638372 in words is "twelve billion, five hundred ninety-one million, six hundred thirty-eight thousand, three hundred seventy-two".