77886716317 has 2 divisors, whose sum is σ = 77886716318. Its totient is φ = 77886716316.

The previous prime is 77886716291. The next prime is 77886716339. The reversal of 77886716317 is 71361768877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77869460601 + 17255716 = 279051^2 + 4154^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77886716317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77886716387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38943358158 + 38943358159.

It is an arithmetic number, because the mean of its divisors is an integer number (38943358159).

Almost surely, 2^77886716317 is an apocalyptic number.

It is an amenable number.

77886716317 is a deficient number, since it is larger than the sum of its proper divisors (1).

77886716317 is an equidigital number, since it uses as much as digits as its factorization.

77886716317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16595712, while the sum is 61.

The spelling of 77886716317 in words is "seventy-seven billion, eight hundred eighty-six million, seven hundred sixteen thousand, three hundred seventeen".