12991922664 has 64 divisors (see below), whose sum is σ = 37129674240. Its totient is φ = 3710988480.

The previous prime is 12991922663. The next prime is 12991922677. The reversal of 12991922664 is 46622919921.

It is not an unprimeable number, because it can be changed into a prime (12991922663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 820567 + ... + 836249.

It is an arithmetic number, because the mean of its divisors is an integer number (580151160).

Almost surely, 2^12991922664 is an apocalyptic number.

12991922664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

12991922664 is an abundant number, since it is smaller than the sum of its proper divisors (24137751576).

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

12991922664 is a wasteful number, since it uses less digits than its factorization.

12991922664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20630 (or 20626 counting only the distinct ones).

The product of its digits is 839808, while the sum is 51.

The spelling of 12991922664 in words is "twelve billion, nine hundred ninety-one million, nine hundred twenty-two thousand, six hundred sixty-four".