668923459 has 2 divisors, whose sum is σ = 668923460. Its totient is φ = 668923458.

The previous prime is 668923439. The next prime is 668923471. The reversal of 668923459 is 954329866.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668923459 is a prime.

It is not a weakly prime, because it can be changed into another prime (668923439) 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, 334461729 + 334461730.

It is an arithmetic number, because the mean of its divisors is an integer number (334461730).

Almost surely, 2^668923459 is an apocalyptic number.

668923459 is a deficient number, since it is larger than the sum of its proper divisors (1).

668923459 is an equidigital number, since it uses as much as digits as its factorization.

668923459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 52.

The square root of 668923459 is about 25863.5546474184. The cubic root of 668923459 is about 874.5650993604.

The spelling of 668923459 in words is "six hundred sixty-eight million, nine hundred twenty-three thousand, four hundred fifty-nine".