668199 has 16 divisors (see below), whose sum is σ = 1041408. Its totient is φ = 373152.

The previous prime is 668179. The next prime is 668201. The reversal of 668199 is 991866.

It is not a de Polignac number, because 668199 - 2⁹ = 667687 is a prime.

668199 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649 + ... + 1325.

It is an arithmetic number, because the mean of its divisors is an integer number (65088).

2⁶⁶⁸¹⁹⁹ is an apocalyptic number.

668199 is a deficient number, since it is larger than the sum of its proper divisors (373209).

668199 is a wasteful number, since it uses less digits than its factorization.

668199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734.

The product of its digits is 23328, while the sum is 39.

The square root of 668199 is about 817.4344010378. The cubic root of 668199 is about 87.4249260821.

The spelling of 668199 in words is "six hundred sixty-eight thousand, one hundred ninety-nine".