317566665761 has 2 divisors, whose sum is σ = 317566665762. Its totient is φ = 317566665760.

The previous prime is 317566665697. The next prime is 317566665763. The reversal of 317566665761 is 167566665713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 291471494161 + 26095171600 = 539881^2 + 161540^2 .

It is a cyclic number.

It is not a de Polignac number, because 317566665761 - 2⁶ = 317566665697 is a prime.

It is a Sophie Germain prime.

Together with 317566665763, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 317566665761.

It is not a weakly prime, because it can be changed into another prime (317566665763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158783332880 + 158783332881.

It is an arithmetic number, because the mean of its divisors is an integer number (158783332881).

Almost surely, 2^317566665761 is an apocalyptic number.

It is an amenable number.

317566665761 is a deficient number, since it is larger than the sum of its proper divisors (1).

317566665761 is an equidigital number, since it uses as much as digits as its factorization.

317566665761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28576800, while the sum is 59.

The spelling of 317566665761 in words is "three hundred seventeen billion, five hundred sixty-six million, six hundred sixty-five thousand, seven hundred sixty-one".