666545666 has 16 divisors (see below), whose sum is σ = 1027382400. Its totient is φ = 324150288.

The previous prime is 666545629. The next prime is 666545683.

666545666 is nontrivially palindromic in base 10.

666545666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 4340 + ... + 36768.

It is an arithmetic number, because the mean of its divisors is an integer number (64211400).

Almost surely, 2^666545666 is an apocalyptic number.

666545666 is a deficient number, since it is larger than the sum of its proper divisors (360836734).

666545666 is a wasteful number, since it uses less digits than its factorization.

666545666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32713.

The product of its digits is 4665600, while the sum is 50.

The square root of 666545666 is about 25817.5457005502. The cubic root of 666545666 is about 873.5276096291.

The spelling of 666545666 in words is "six hundred sixty-six million, five hundred forty-five thousand, six hundred sixty-six".