668243 has 2 divisors, whose sum is σ = 668244. Its totient is φ = 668242.

The previous prime is 668221. The next prime is 668273. The reversal of 668243 is 342866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668243 - 2⁶ = 668179 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334121 + 334122.

It is an arithmetic number, because the mean of its divisors is an integer number (334122).

2⁶⁶⁸²⁴³ is an apocalyptic number.

668243 is a deficient number, since it is larger than the sum of its proper divisors (1).

668243 is an equidigital number, since it uses as much as digits as its factorization.

668243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 29.

The square root of 668243 is about 817.4613140694. The cubic root of 668243 is about 87.4268449777.

The spelling of 668243 in words is "six hundred sixty-eight thousand, two hundred forty-three".