680061817 has 2 divisors, whose sum is σ = 680061818. Its totient is φ = 680061816.

The previous prime is 680061797. The next prime is 680061827. The reversal of 680061817 is 718160086.

680061817 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., 369562176 + 310499641 = 19224^2 + 17621^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680061817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (680061827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340030908 + 340030909.

It is an arithmetic number, because the mean of its divisors is an integer number (340030909).

Almost surely, 2^680061817 is an apocalyptic number.

It is an amenable number.

680061817 is a deficient number, since it is larger than the sum of its proper divisors (1).

680061817 is an equidigital number, since it uses as much as digits as its factorization.

680061817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 680061817 is about 26077.9948807419. The cubic root of 680061817 is about 879.3925805673.

The spelling of 680061817 in words is "six hundred eighty million, sixty-one thousand, eight hundred seventeen".