12999657791 has 2 divisors, whose sum is σ = 12999657792. Its totient is φ = 12999657790.

The previous prime is 12999657779. The next prime is 12999657833. The reversal of 12999657791 is 19775699921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12999657791 - 2¹⁰ = 12999656767 is a prime.

It is a super-2 number, since 2×12999657791² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12999657091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6499828895 + 6499828896.

It is an arithmetic number, because the mean of its divisors is an integer number (6499828896).

Almost surely, 2^12999657791 is an apocalyptic number.

12999657791 is a deficient number, since it is larger than the sum of its proper divisors (1).

12999657791 is an equidigital number, since it uses as much as digits as its factorization.

12999657791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19289340, while the sum is 65.

The spelling of 12999657791 in words is "twelve billion, nine hundred ninety-nine million, six hundred fifty-seven thousand, seven hundred ninety-one".