680080861 has 2 divisors, whose sum is σ = 680080862. Its totient is φ = 680080860.

The previous prime is 680080811. The next prime is 680080873. The reversal of 680080861 is 168080086.

680080861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 663320025 + 16760836 = 25755^2 + 4094^2 .

It is a cyclic number.

It is not a de Polignac number, because 680080861 - 2²⁵ = 646526429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 680080861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680080811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340040430 + 340040431.

It is an arithmetic number, because the mean of its divisors is an integer number (340040431).

Almost surely, 2^680080861 is an apocalyptic number.

It is an amenable number.

680080861 is a deficient number, since it is larger than the sum of its proper divisors (1).

680080861 is an equidigital number, since it uses as much as digits as its factorization.

680080861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 680080861 is about 26078.3600136205. The cubic root of 680080861 is about 879.4007891329.

The spelling of 680080861 in words is "six hundred eighty million, eighty thousand, eight hundred sixty-one".