668080999 has 2 divisors, whose sum is σ = 668081000. Its totient is φ = 668080998.

The previous prime is 668080993. The next prime is 668081003. The reversal of 668080999 is 999080866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668080999 - 2⁹ = 668080487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668080993) 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, 334040499 + 334040500.

It is an arithmetic number, because the mean of its divisors is an integer number (334040500).

Almost surely, 2^668080999 is an apocalyptic number.

668080999 is a deficient number, since it is larger than the sum of its proper divisors (1).

668080999 is an equidigital number, since it uses as much as digits as its factorization.

668080999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 668080999 is about 25847.2628918421. The cubic root of 668080999 is about 874.1977949354.

The spelling of 668080999 in words is "six hundred sixty-eight million, eighty thousand, nine hundred ninety-nine".