12991710816 has 144 divisors (see below), whose sum is σ = 44059002624. Its totient is φ = 3550516992.

The previous prime is 12991710757. The next prime is 12991710859. The reversal of 12991710816 is 61801719921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93726 + ... + 186461.

It is an arithmetic number, because the mean of its divisors is an integer number (305965296).

Almost surely, 2^12991710816 is an apocalyptic number.

12991710816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12991710816 is an abundant number, since it is smaller than the sum of its proper divisors (31067291808).

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

12991710816 is a wasteful number, since it uses less digits than its factorization.

12991710816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280233 (or 280222 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 45.

The spelling of 12991710816 in words is "twelve billion, nine hundred ninety-one million, seven hundred ten thousand, eight hundred sixteen".