668420673 has 16 divisors (see below), whose sum is σ = 898630656. Its totient is φ = 441925200.

The previous prime is 668420657. The next prime is 668420689. The reversal of 668420673 is 376024866.

668420673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (668420657) and next prime (668420689).

It is not a de Polignac number, because 668420673 - 2⁴ = 668420657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (668420633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260748 + ... + 263298.

It is an arithmetic number, because the mean of its divisors is an integer number (56164416).

Almost surely, 2^668420673 is an apocalyptic number.

It is an amenable number.

668420673 is a deficient number, since it is larger than the sum of its proper divisors (230209983).

668420673 is a wasteful number, since it uses less digits than its factorization.

668420673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244.

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 668420673 is about 25853.8328493088. The cubic root of 668420673 is about 874.3459266497.

The spelling of 668420673 in words is "six hundred sixty-eight million, four hundred twenty thousand, six hundred seventy-three".