680806807309 has 2 divisors, whose sum is σ = 680806807310. Its totient is φ = 680806807308.

The previous prime is 680806807283. The next prime is 680806807363. The reversal of 680806807309 is 903708608086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 637043422500 + 43763384809 = 798150^2 + 209197^2 .

It is a cyclic number.

It is not a de Polignac number, because 680806807309 - 2¹³ = 680806799117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 680806807309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680806817309) 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, 340403403654 + 340403403655.

It is an arithmetic number, because the mean of its divisors is an integer number (340403403655).

Almost surely, 2^680806807309 is an apocalyptic number.

It is an amenable number.

680806807309 is a deficient number, since it is larger than the sum of its proper divisors (1).

680806807309 is an equidigital number, since it uses as much as digits as its factorization.

680806807309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 680806807309 in words is "six hundred eighty billion, eight hundred six million, eight hundred seven thousand, three hundred nine".