680663087717 has 2 divisors, whose sum is σ = 680663087718. Its totient is φ = 680663087716.

The previous prime is 680663087659. The next prime is 680663087729. The reversal of 680663087717 is 717780366086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 492468501121 + 188194586596 = 701761^2 + 433814^2 .

It is a cyclic number.

It is not a de Polignac number, because 680663087717 - 2¹⁸ = 680662825573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680663087747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340331543858 + 340331543859.

It is an arithmetic number, because the mean of its divisors is an integer number (340331543859).

Almost surely, 2^680663087717 is an apocalyptic number.

It is an amenable number.

680663087717 is a deficient number, since it is larger than the sum of its proper divisors (1).

680663087717 is an equidigital number, since it uses as much as digits as its factorization.

680663087717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14224896, while the sum is 59.

The spelling of 680663087717 in words is "six hundred eighty billion, six hundred sixty-three million, eighty-seven thousand, seven hundred seventeen".