668923451 has 12 divisors (see below), whose sum is σ = 778855752. Its totient is φ = 572832288.

The previous prime is 668923439. The next prime is 668923459. The reversal of 668923451 is 154329866.

It is not a de Polignac number, because 668923451 - 2¹⁴ = 668907067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668923459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52736 + ... + 64178.

It is an arithmetic number, because the mean of its divisors is an integer number (64904646).

Almost surely, 2^668923451 is an apocalyptic number.

668923451 is a deficient number, since it is larger than the sum of its proper divisors (109932301).

668923451 is a wasteful number, since it uses less digits than its factorization.

668923451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12650 (or 12643 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 668923451 is about 25863.5544927607. The cubic root of 668923451 is about 874.5650958740.

The spelling of 668923451 in words is "six hundred sixty-eight million, nine hundred twenty-three thousand, four hundred fifty-one".