12991311967 has 2 divisors, whose sum is σ = 12991311968. Its totient is φ = 12991311966.

The previous prime is 12991311961. The next prime is 12991312003. The reversal of 12991311967 is 76911319921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12991311967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12991311967.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12991311961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6495655983 + 6495655984.

It is an arithmetic number, because the mean of its divisors is an integer number (6495655984).

Almost surely, 2^12991311967 is an apocalyptic number.

12991311967 is a deficient number, since it is larger than the sum of its proper divisors (1).

12991311967 is an equidigital number, since it uses as much as digits as its factorization.

12991311967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 49.

The spelling of 12991311967 in words is "twelve billion, nine hundred ninety-one million, three hundred eleven thousand, nine hundred sixty-seven".