666700717 has 2 divisors, whose sum is σ = 666700718. Its totient is φ = 666700716.

The previous prime is 666700711. The next prime is 666700813. The reversal of 666700717 is 717007666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 550793961 + 115906756 = 23469^2 + 10766^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666700717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666700717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666700711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333350358 + 333350359.

It is an arithmetic number, because the mean of its divisors is an integer number (333350359).

Almost surely, 2^666700717 is an apocalyptic number.

It is an amenable number.

666700717 is a deficient number, since it is larger than the sum of its proper divisors (1).

666700717 is an equidigital number, since it uses as much as digits as its factorization.

666700717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 666700717 is about 25820.5483481664. The cubic root of 666700717 is about 873.5953373361.

The spelling of 666700717 in words is "six hundred sixty-six million, seven hundred thousand, seven hundred seventeen".