668699 has 2 divisors, whose sum is σ = 668700. Its totient is φ = 668698.

The previous prime is 668687. The next prime is 668713. The reversal of 668699 is 996866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668699 - 2¹² = 664603 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668699.

It is not a weakly prime, because it can be changed into another prime (668609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334349 + 334350.

It is an arithmetic number, because the mean of its divisors is an integer number (334350).

2⁶⁶⁸⁶⁹⁹ is an apocalyptic number.

668699 is a deficient number, since it is larger than the sum of its proper divisors (1).

668699 is an equidigital number, since it uses as much as digits as its factorization.

668699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 44.

The square root of 668699 is about 817.7401787854. The cubic root of 668699 is about 87.4467267555.

The spelling of 668699 in words is "six hundred sixty-eight thousand, six hundred ninety-nine".