12721652868 has 24 divisors (see below), whose sum is σ = 29706674368. Its totient is φ = 4237291296.

The previous prime is 12721652851. The next prime is 12721652893. The reversal of 12721652868 is 86825612721.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391171 + ... + 422442.

Almost surely, 2^12721652868 is an apocalyptic number.

It is an amenable number.

12721652868 is an abundant number, since it is smaller than the sum of its proper divisors (16985021500).

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

12721652868 is a wasteful number, since it uses less digits than its factorization.

12721652868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814923 (or 814921 counting only the distinct ones).

The product of its digits is 645120, while the sum is 48.

The spelling of 12721652868 in words is "twelve billion, seven hundred twenty-one million, six hundred fifty-two thousand, eight hundred sixty-eight".