666585666 has 16 divisors (see below), whose sum is σ = 1481301600. Its totient is φ = 222195204.

The previous prime is 666585641. The next prime is 666585679.

666585666 is nontrivially palindromic in base 10.

666585666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 12344179 = 666585666 / (6 + 6 + 6 + 5 + 8 + 5 + 6 + 6 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6172036 + ... + 6172143.

It is an arithmetic number, because the mean of its divisors is an integer number (92581350).

Almost surely, 2^666585666 is an apocalyptic number.

666585666 is an abundant number, since it is smaller than the sum of its proper divisors (814715934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666585666 is a wasteful number, since it uses less digits than its factorization.

666585666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12344190 (or 12344184 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 54.

The square root of 666585666 is about 25818.3203559023. The cubic root of 666585666 is about 873.5450830033.

The spelling of 666585666 in words is "six hundred sixty-six million, five hundred eighty-five thousand, six hundred sixty-six".