668599 has 2 divisors, whose sum is σ = 668600. Its totient is φ = 668598.

The previous prime is 668581. The next prime is 668609. The reversal of 668599 is 995866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668599 - 2⁵ = 668567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334299 + 334300.

It is an arithmetic number, because the mean of its divisors is an integer number (334300).

2⁶⁶⁸⁵⁹⁹ is an apocalyptic number.

668599 is a deficient number, since it is larger than the sum of its proper divisors (1).

668599 is an equidigital number, since it uses as much as digits as its factorization.

668599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 668599 is about 817.6790323837. The cubic root of 668599 is about 87.4423674904.

The spelling of 668599 in words is "six hundred sixty-eight thousand, five hundred ninety-nine".