668774459 has 2 divisors, whose sum is σ = 668774460. Its totient is φ = 668774458.

The previous prime is 668774443. The next prime is 668774479. The reversal of 668774459 is 954477866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668774459 - 2⁴ = 668774443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668774419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334387229 + 334387230.

It is an arithmetic number, because the mean of its divisors is an integer number (334387230).

Almost surely, 2^668774459 is an apocalyptic number.

668774459 is a deficient number, since it is larger than the sum of its proper divisors (1).

668774459 is an equidigital number, since it uses as much as digits as its factorization.

668774459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 56.

The square root of 668774459 is about 25860.6739858032. The cubic root of 668774459 is about 874.5001592568.

The spelling of 668774459 in words is "six hundred sixty-eight million, seven hundred seventy-four thousand, four hundred fifty-nine".