12971766779 has 2 divisors, whose sum is σ = 12971766780. Its totient is φ = 12971766778.

The previous prime is 12971766737. The next prime is 12971766817. The reversal of 12971766779 is 97766717921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12971766779 - 2⁸ = 12971766523 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12971766079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6485883389 + 6485883390.

It is an arithmetic number, because the mean of its divisors is an integer number (6485883390).

Almost surely, 2^12971766779 is an apocalyptic number.

12971766779 is a deficient number, since it is larger than the sum of its proper divisors (1).

12971766779 is an equidigital number, since it uses as much as digits as its factorization.

12971766779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14002632, while the sum is 62.

The spelling of 12971766779 in words is "twelve billion, nine hundred seventy-one million, seven hundred sixty-six thousand, seven hundred seventy-nine".