717670661 has 2 divisors, whose sum is σ = 717670662. Its totient is φ = 717670660.

The previous prime is 717670637. The next prime is 717670711. The reversal of 717670661 is 166076717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 714760225 + 2910436 = 26735^2 + 1706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-717670661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (717675661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358835330 + 358835331.

It is an arithmetic number, because the mean of its divisors is an integer number (358835331).

Almost surely, 2^717670661 is an apocalyptic number.

It is an amenable number.

717670661 is a deficient number, since it is larger than the sum of its proper divisors (1).

717670661 is an equidigital number, since it uses as much as digits as its factorization.

717670661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74088, while the sum is 41.

The square root of 717670661 is about 26789.3758979189. The cubic root of 717670661 is about 895.3133578106.

The spelling of 717670661 in words is "seven hundred seventeen million, six hundred seventy thousand, six hundred sixty-one".