666608305 has 32 divisors (see below), whose sum is σ = 890942976. Its totient is φ = 474720000.

The previous prime is 666608281. The next prime is 666608321. The reversal of 666608305 is 503806666.

It is not a de Polignac number, because 666608305 - 2⁷ = 666608177 is a prime.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 1445775 + ... + 1446235.

It is an arithmetic number, because the mean of its divisors is an integer number (27841968).

Almost surely, 2^666608305 is an apocalyptic number.

It is an amenable number.

666608305 is a deficient number, since it is larger than the sum of its proper divisors (224334671).

666608305 is a wasteful number, since it uses less digits than its factorization.

666608305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 666608305 is about 25818.7587811653. The cubic root of 666608305 is about 873.5549721864.

The spelling of 666608305 in words is "six hundred sixty-six million, six hundred eight thousand, three hundred five".