66560616732317 has 2 divisors, whose sum is σ = 66560616732318. Its totient is φ = 66560616732316.

The previous prime is 66560616732199. The next prime is 66560616732343. The reversal of 66560616732317 is 71323761606566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58544136199396 + 8016480532921 = 7651414^2 + 2831339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66560616732317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66560616734317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33280308366158 + 33280308366159.

It is an arithmetic number, because the mean of its divisors is an integer number (33280308366159).

Almost surely, 2^{66560616732317} is an apocalyptic number.

It is an amenable number.

66560616732317 is a deficient number, since it is larger than the sum of its proper divisors (1).

66560616732317 is an equidigital number, since it uses as much as digits as its factorization.

66560616732317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34292160, while the sum is 59.

The spelling of 66560616732317 in words is "sixty-six trillion, five hundred sixty billion, six hundred sixteen million, seven hundred thirty-two thousand, three hundred seventeen".