680916772717 has 2 divisors, whose sum is σ = 680916772718. Its totient is φ = 680916772716.

The previous prime is 680916772699. The next prime is 680916772727. The reversal of 680916772717 is 717277619086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 676636211241 + 4280561476 = 822579^2 + 65426^2 .

It is a cyclic number.

It is not a de Polignac number, because 680916772717 - 2¹¹ = 680916770669 is a prime.

It is a super-3 number, since 3×680916772717³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680916772727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340458386358 + 340458386359.

It is an arithmetic number, because the mean of its divisors is an integer number (340458386359).

Almost surely, 2^680916772717 is an apocalyptic number.

It is an amenable number.

680916772717 is a deficient number, since it is larger than the sum of its proper divisors (1).

680916772717 is an equidigital number, since it uses as much as digits as its factorization.

680916772717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12446784, while the sum is 61.

The spelling of 680916772717 in words is "six hundred eighty billion, nine hundred sixteen million, seven hundred seventy-two thousand, seven hundred seventeen".