12591208956 has 24 divisors (see below), whose sum is σ = 29485558480. Its totient is φ = 4181916672.

The previous prime is 12591208909. The next prime is 12591208991. The reversal of 12591208956 is 65980219521.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1890661 + ... + 1897308.

Almost surely, 2^12591208956 is an apocalyptic number.

It is an amenable number.

12591208956 is an abundant number, since it is smaller than the sum of its proper divisors (16894349524).

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

12591208956 is a wasteful number, since it uses less digits than its factorization.

12591208956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788253 (or 3788251 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 48.

The spelling of 12591208956 in words is "twelve billion, five hundred ninety-one million, two hundred eight thousand, nine hundred fifty-six".