666846032812217 has 2 divisors, whose sum is σ = 666846032812218. Its totient is φ = 666846032812216.

The previous prime is 666846032812039. The next prime is 666846032812283. The reversal of 666846032812217 is 712218230648666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661587537166336 + 5258495645881 = 25721344^2 + 2293141^2 .

It is a cyclic number.

It is not a de Polignac number, because 666846032812217 - 2²⁰ = 666846031763641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666846032812217.

It is not a weakly prime, because it can be changed into another prime (666846032812517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333423016406108 + 333423016406109.

It is an arithmetic number, because the mean of its divisors is an integer number (333423016406109).

Almost surely, 2^{666846032812217} is an apocalyptic number.

It is an amenable number.

666846032812217 is a deficient number, since it is larger than the sum of its proper divisors (1).

666846032812217 is an equidigital number, since it uses as much as digits as its factorization.

666846032812217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55738368, while the sum is 62.

The spelling of 666846032812217 in words is "six hundred sixty-six trillion, eight hundred forty-six billion, thirty-two million, eight hundred twelve thousand, two hundred seventeen".