668169259 has 2 divisors, whose sum is σ = 668169260. Its totient is φ = 668169258.

The previous prime is 668169253. The next prime is 668169263. The reversal of 668169259 is 952961866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668169259 - 2⁹ = 668168747 is a prime.

It is not a weakly prime, because it can be changed into another prime (668169253) 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, 334084629 + 334084630.

It is an arithmetic number, because the mean of its divisors is an integer number (334084630).

Almost surely, 2^668169259 is an apocalyptic number.

668169259 is a deficient number, since it is larger than the sum of its proper divisors (1).

668169259 is an equidigital number, since it uses as much as digits as its factorization.

668169259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 52.

The square root of 668169259 is about 25848.9701729102. The cubic root of 668169259 is about 874.2362899183.

The spelling of 668169259 in words is "six hundred sixty-eight million, one hundred sixty-nine thousand, two hundred fifty-nine".