668999299 has 2 divisors, whose sum is σ = 668999300. Its totient is φ = 668999298.

The previous prime is 668999293. The next prime is 668999311. The reversal of 668999299 is 992999866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668999299 - 2⁹ = 668998787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (668999293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334499649 + 334499650.

It is an arithmetic number, because the mean of its divisors is an integer number (334499650).

Almost surely, 2^668999299 is an apocalyptic number.

668999299 is a deficient number, since it is larger than the sum of its proper divisors (1).

668999299 is an equidigital number, since it uses as much as digits as its factorization.

668999299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34012224, while the sum is 67.

The square root of 668999299 is about 25865.0207616387. The cubic root of 668999299 is about 874.5981497340.

The spelling of 668999299 in words is "six hundred sixty-eight million, nine hundred ninety-nine thousand, two hundred ninety-nine".