12561544325 has 24 divisors (see below), whose sum is σ = 17005831200. Its totient is φ = 9128417600.

The previous prime is 12561544301. The next prime is 12561544337. The reversal of 12561544325 is 52344516521.

It is not a de Polignac number, because 12561544325 - 2²⁰ = 12560495749 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 341951 + ... + 376899.

It is an arithmetic number, because the mean of its divisors is an integer number (708576300).

Almost surely, 2^12561544325 is an apocalyptic number.

It is an amenable number.

12561544325 is a deficient number, since it is larger than the sum of its proper divisors (4444286875).

12561544325 is a wasteful number, since it uses less digits than its factorization.

12561544325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36277 (or 36272 counting only the distinct ones).

The product of its digits is 144000, while the sum is 38.

The spelling of 12561544325 in words is "twelve billion, five hundred sixty-one million, five hundred forty-four thousand, three hundred twenty-five".