668005339 has 2 divisors, whose sum is σ = 668005340. Its totient is φ = 668005338.

The previous prime is 668005319. The next prime is 668005397. The reversal of 668005339 is 933500866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668005339 - 2¹³ = 667997147 is a prime.

It is a super-2 number, since 2×668005339² = 892462265865009842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (668005319) 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, 334002669 + 334002670.

It is an arithmetic number, because the mean of its divisors is an integer number (334002670).

Almost surely, 2^668005339 is an apocalyptic number.

668005339 is a deficient number, since it is larger than the sum of its proper divisors (1).

668005339 is an equidigital number, since it uses as much as digits as its factorization.

668005339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 668005339 is about 25845.7992524898. The cubic root of 668005339 is about 874.1647927983.

The spelling of 668005339 in words is "six hundred sixty-eight million, five thousand, three hundred thirty-nine".