680355749 has 2 divisors, whose sum is σ = 680355750. Its totient is φ = 680355748.

The previous prime is 680355737. The next prime is 680355757. The reversal of 680355749 is 947553086.

680355749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646074724 + 34281025 = 25418^2 + 5855^2 .

It is a cyclic number.

It is not a de Polignac number, because 680355749 - 2⁴ = 680355733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680355799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340177874 + 340177875.

It is an arithmetic number, because the mean of its divisors is an integer number (340177875).

Almost surely, 2^680355749 is an apocalyptic number.

It is an amenable number.

680355749 is a deficient number, since it is larger than the sum of its proper divisors (1).

680355749 is an equidigital number, since it uses as much as digits as its factorization.

680355749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 47.

The square root of 680355749 is about 26083.6299045973. The cubic root of 680355749 is about 879.5192574775.

The spelling of 680355749 in words is "six hundred eighty million, three hundred fifty-five thousand, seven hundred forty-nine".