12911117640 has 32 divisors (see below), whose sum is σ = 38733353280. Its totient is φ = 3442964672.

The previous prime is 12911117623. The next prime is 12911117729. The reversal of 12911117640 is 4671111921.

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, 53796204 + ... + 53796443.

It is an arithmetic number, because the mean of its divisors is an integer number (1210417290).

Almost surely, 2^12911117640 is an apocalyptic number.

12911117640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12911117640 is an abundant number, since it is smaller than the sum of its proper divisors (25822235640).

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

12911117640 is a wasteful number, since it uses less digits than its factorization.

12911117640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107592661 (or 107592657 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 33.

The spelling of 12911117640 in words is "twelve billion, nine hundred eleven million, one hundred seventeen thousand, six hundred forty".