680557937 has 2 divisors, whose sum is σ = 680557938. Its totient is φ = 680557936.

The previous prime is 680557859. The next prime is 680557963. The reversal of 680557937 is 739755086.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665433616 + 15124321 = 25796^2 + 3889^2 .

It is a cyclic number.

It is not a de Polignac number, because 680557937 - 2¹⁴ = 680541553 is a prime.

It is a super-2 number, since 2×680557937² = 926318211227391938, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (680557967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340278968 + 340278969.

It is an arithmetic number, because the mean of its divisors is an integer number (340278969).

Almost surely, 2^680557937 is an apocalyptic number.

It is an amenable number.

680557937 is a deficient number, since it is larger than the sum of its proper divisors (1).

680557937 is an equidigital number, since it uses as much as digits as its factorization.

680557937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The square root of 680557937 is about 26087.5053809290. The cubic root of 680557937 is about 879.6063739736.

The spelling of 680557937 in words is "six hundred eighty million, five hundred fifty-seven thousand, nine hundred thirty-seven".