12540636625 has 48 divisors (see below), whose sum is σ = 17668581840. Its totient is φ = 8873568000.

The previous prime is 12540636613. The next prime is 12540636643. The reversal of 12540636625 is 52663604521.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1451914816 + 11088721809 = 38104^2 + 105303^2 .

It is not a de Polignac number, because 12540636625 - 2⁵ = 12540636593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 548421 + ... + 570829.

It is an arithmetic number, because the mean of its divisors is an integer number (368095455).

Almost surely, 2^12540636625 is an apocalyptic number.

It is an amenable number.

12540636625 is a deficient number, since it is larger than the sum of its proper divisors (5127945215).

12540636625 is a wasteful number, since it uses less digits than its factorization.

12540636625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22483 (or 22462 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 12540636625 in words is "twelve billion, five hundred forty million, six hundred thirty-six thousand, six hundred twenty-five".