668923439 has 2 divisors, whose sum is σ = 668923440. Its totient is φ = 668923438.

The previous prime is 668923433. The next prime is 668923459. The reversal of 668923439 is 934329866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668923439 - 2²⁴ = 652146223 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668923433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334461719 + 334461720.

It is an arithmetic number, because the mean of its divisors is an integer number (334461720).

Almost surely, 2^668923439 is an apocalyptic number.

668923439 is a deficient number, since it is larger than the sum of its proper divisors (1).

668923439 is an equidigital number, since it uses as much as digits as its factorization.

668923439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 50.

The square root of 668923439 is about 25863.5542607740. The cubic root of 668923439 is about 874.5650906443.

The spelling of 668923439 in words is "six hundred sixty-eight million, nine hundred twenty-three thousand, four hundred thirty-nine".