668159 has 2 divisors, whose sum is σ = 668160.
Its totient is φ = 668158.
The previous prime is 668153. The next prime is 668179. The reversal of 668159 is 951866.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 668159 - 28 = 667903 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (668153) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334079 + 334080.
It is an arithmetic number, because the mean of its divisors is an integer number (334080).
2668159 is an apocalyptic number.
668159 is a deficient number, since it is larger than the sum of its proper divisors (1).
668159 is an equidigital number, since it uses as much as digits as its factorization.
668159 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 12960, while the sum is 35.
The square root of 668159 is about 817.4099338765.
The cubic root of 668159 is about 87.4231815585.
The spelling of 668159 in words is "six hundred sixty-eight thousand, one hundred fifty-nine".