680385869 has 2 divisors, whose sum is σ = 680385870. Its totient is φ = 680385868.

The previous prime is 680385851. The next prime is 680385913. The reversal of 680385869 is 968583086.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 460960900 + 219424969 = 21470^2 + 14813^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680385869 is a prime.

It is a super-2 number, since 2×680385869² = 925849861469770322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 680385869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680385569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340192934 + 340192935.

It is an arithmetic number, because the mean of its divisors is an integer number (340192935).

Almost surely, 2^680385869 is an apocalyptic number.

It is an amenable number.

680385869 is a deficient number, since it is larger than the sum of its proper divisors (1).

680385869 is an equidigital number, since it uses as much as digits as its factorization.

680385869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 53.

The square root of 680385869 is about 26084.2072718340. The cubic root of 680385869 is about 879.5322363390.

The spelling of 680385869 in words is "six hundred eighty million, three hundred eighty-five thousand, eight hundred sixty-nine".