680740553 has 2 divisors, whose sum is σ = 680740554. Its totient is φ = 680740552.

The previous prime is 680740523. The next prime is 680740573. The reversal of 680740553 is 355047086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646786624 + 33953929 = 25432^2 + 5827^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680740553 is a prime.

It is not a weakly prime, because it can be changed into another prime (680740523) 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, 340370276 + 340370277.

It is an arithmetic number, because the mean of its divisors is an integer number (340370277).

Almost surely, 2^680740553 is an apocalyptic number.

It is an amenable number.

680740553 is a deficient number, since it is larger than the sum of its proper divisors (1).

680740553 is an equidigital number, since it uses as much as digits as its factorization.

680740553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 680740553 is about 26091.0052125249. The cubic root of 680740553 is about 879.6850426774.

The spelling of 680740553 in words is "six hundred eighty million, seven hundred forty thousand, five hundred fifty-three".