680887997 has 2 divisors, whose sum is σ = 680887998. Its totient is φ = 680887996.

The previous prime is 680887957. The next prime is 680888041. The reversal of 680887997 is 799788086.

680887997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 494128441 + 186759556 = 22229^2 + 13666^2 .

It is a cyclic number.

It is not a de Polignac number, because 680887997 - 2⁸ = 680887741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680887957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340443998 + 340443999.

It is an arithmetic number, because the mean of its divisors is an integer number (340443999).

Almost surely, 2^680887997 is an apocalyptic number.

It is an amenable number.

680887997 is a deficient number, since it is larger than the sum of its proper divisors (1).

680887997 is an equidigital number, since it uses as much as digits as its factorization.

680887997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12192768, while the sum is 62.

The square root of 680887997 is about 26093.8306310131. The cubic root of 680887997 is about 879.7485494558.

The spelling of 680887997 in words is "six hundred eighty million, eight hundred eighty-seven thousand, nine hundred ninety-seven".