660444066 has 24 divisors (see below), whose sum is σ = 1506276720. Its totient is φ = 208561176.

The previous prime is 660444041. The next prime is 660444079.

It is a happy number.

660444066 is a `hidden beast` number, since 6 + 604 + 4 + 40 + 6 + 6 = 666.

660444066 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×660444066² = 872372728629224712, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 660444066.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 965220 + ... + 965903.

It is an arithmetic number, because the mean of its divisors is an integer number (62761530).

Almost surely, 2^660444066 is an apocalyptic number.

660444066 is an abundant number, since it is smaller than the sum of its proper divisors (845832654).

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

660444066 is a wasteful number, since it uses less digits than its factorization.

660444066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931150 (or 1931147 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 660444066 is about 25699.1063268745. The cubic root of 660444066 is about 870.8539929950.

The spelling of 660444066 in words is "six hundred sixty million, four hundred forty-four thousand, sixty-six".