680344897 has 2 divisors, whose sum is σ = 680344898. Its totient is φ = 680344896.

The previous prime is 680344883. The next prime is 680344921. The reversal of 680344897 is 798443086.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 364962816 + 315382081 = 19104^2 + 17759^2 .

It is a cyclic number.

It is not a de Polignac number, because 680344897 - 2²³ = 671956289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 680344897.

It is not a weakly prime, because it can be changed into another prime (680344397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340172448 + 340172449.

It is an arithmetic number, because the mean of its divisors is an integer number (340172449).

Almost surely, 2^680344897 is an apocalyptic number.

It is an amenable number.

680344897 is a deficient number, since it is larger than the sum of its proper divisors (1).

680344897 is an equidigital number, since it uses as much as digits as its factorization.

680344897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The square root of 680344897 is about 26083.4218805739. The cubic root of 680344897 is about 879.5145812016.

The spelling of 680344897 in words is "six hundred eighty million, three hundred forty-four thousand, eight hundred ninety-seven".