9166805251217 has 2 divisors, whose sum is σ = 9166805251218. Its totient is φ = 9166805251216.

The previous prime is 9166805251183. The next prime is 9166805251237. The reversal of 9166805251217 is 7121525086619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7359262137616 + 1807543113601 = 2712796^2 + 1344449^2 .

It is a cyclic number.

It is not a de Polignac number, because 9166805251217 - 2²⁰ = 9166804202641 is a prime.

It is not a weakly prime, because it can be changed into another prime (9166805251237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4583402625608 + 4583402625609.

It is an arithmetic number, because the mean of its divisors is an integer number (4583402625609).

Almost surely, 2^{9166805251217} is an apocalyptic number.

It is an amenable number.

9166805251217 is a deficient number, since it is larger than the sum of its proper divisors (1).

9166805251217 is an equidigital number, since it uses as much as digits as its factorization.

9166805251217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 9166805251217 in words is "nine trillion, one hundred sixty-six billion, eight hundred five million, two hundred fifty-one thousand, two hundred seventeen".