664223166 has 40 divisors (see below), whose sum is σ = 1566693480. Its totient is φ = 209753712.

The previous prime is 664223159. The next prime is 664223171. The reversal of 664223166 is 661322466.

664223166 is a `hidden beast` number, since 6 + 642 + 2 + 3 + 1 + 6 + 6 = 666.

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 664223166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 104821 + ... + 110976.

It is an arithmetic number, because the mean of its divisors is an integer number (39167337).

Almost surely, 2^664223166 is an apocalyptic number.

664223166 is an abundant number, since it is smaller than the sum of its proper divisors (902470314).

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

664223166 is a wasteful number, since it uses less digits than its factorization.

664223166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215830 (or 215821 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 664223166 is about 25772.5273498739. The cubic root of 664223166 is about 872.5118608799.

The spelling of 664223166 in words is "six hundred sixty-four million, two hundred twenty-three thousand, one hundred sixty-six".