668713 has 2 divisors, whose sum is σ = 668714. Its totient is φ = 668712.

The previous prime is 668699. The next prime is 668719. The reversal of 668713 is 317866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660969 + 7744 = 813^2 + 88^2 .

It is a cyclic number.

It is not a de Polignac number, because 668713 - 2⁹ = 668201 is a prime.

668713 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (668719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334356 + 334357.

It is an arithmetic number, because the mean of its divisors is an integer number (334357).

2⁶⁶⁸⁷¹³ is an apocalyptic number.

It is an amenable number.

668713 is a deficient number, since it is larger than the sum of its proper divisors (1).

668713 is an equidigital number, since it uses as much as digits as its factorization.

668713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 668713 is about 817.7487389168. The cubic root of 668713 is about 87.4473370180.

The spelling of 668713 in words is "six hundred sixty-eight thousand, seven hundred thirteen".