668466923 has 2 divisors, whose sum is σ = 668466924. Its totient is φ = 668466922.

The previous prime is 668466881. The next prime is 668466937. The reversal of 668466923 is 329664866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668466923 - 2⁶ = 668466859 is a prime.

It is not a weakly prime, because it can be changed into another prime (668466943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334233461 + 334233462.

It is an arithmetic number, because the mean of its divisors is an integer number (334233462).

Almost surely, 2^668466923 is an apocalyptic number.

668466923 is a deficient number, since it is larger than the sum of its proper divisors (1).

668466923 is an equidigital number, since it uses as much as digits as its factorization.

668466923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 50.

The square root of 668466923 is about 25854.7272853534. The cubic root of 668466923 is about 874.3660923767.

The spelling of 668466923 in words is "six hundred sixty-eight million, four hundred sixty-six thousand, nine hundred twenty-three".