12561635984 has 40 divisors (see below), whose sum is σ = 26445569280. Its totient is φ = 5758300800.

The previous prime is 12561635929. The next prime is 12561636007. The reversal of 12561635984 is 48953616521.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657047 + ... + 675894.

It is an arithmetic number, because the mean of its divisors is an integer number (661139232).

Almost surely, 2^12561635984 is an apocalyptic number.

It is an amenable number.

12561635984 is an abundant number, since it is smaller than the sum of its proper divisors (13883933296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12561635984 is a wasteful number, since it uses less digits than its factorization.

12561635984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332999 (or 1332993 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 50.

The spelling of 12561635984 in words is "twelve billion, five hundred sixty-one million, six hundred thirty-five thousand, nine hundred eighty-four".