12516977797 has 2 divisors, whose sum is σ = 12516977798. Its totient is φ = 12516977796.

The previous prime is 12516977749. The next prime is 12516977839. The reversal of 12516977797 is 79777961521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12515791876 + 1185921 = 111874^2 + 1089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12516977797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12516977897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6258488898 + 6258488899.

It is an arithmetic number, because the mean of its divisors is an integer number (6258488899).

Almost surely, 2^12516977797 is an apocalyptic number.

It is an amenable number.

12516977797 is a deficient number, since it is larger than the sum of its proper divisors (1).

12516977797 is an equidigital number, since it uses as much as digits as its factorization.

12516977797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11668860, while the sum is 61.

The spelling of 12516977797 in words is "twelve billion, five hundred sixteen million, nine hundred seventy-seven thousand, seven hundred ninety-seven".