668836339 has 2 divisors, whose sum is σ = 668836340. Its totient is φ = 668836338.

The previous prime is 668836313. The next prime is 668836361. The reversal of 668836339 is 933638866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668836339 - 2⁵ = 668836307 is a prime.

It is not a weakly prime, because it can be changed into another prime (668836369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334418169 + 334418170.

It is an arithmetic number, because the mean of its divisors is an integer number (334418170).

Almost surely, 2^668836339 is an apocalyptic number.

668836339 is a deficient number, since it is larger than the sum of its proper divisors (1).

668836339 is an equidigital number, since it uses as much as digits as its factorization.

668836339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 52.

The square root of 668836339 is about 25861.8703693294. The cubic root of 668836339 is about 874.5271301836.

The spelling of 668836339 in words is "six hundred sixty-eight million, eight hundred thirty-six thousand, three hundred thirty-nine".