664110666 has 24 divisors (see below), whose sum is σ = 1441109124. Its totient is φ = 221031360.

The previous prime is 664110659. The next prime is 664110679. The reversal of 664110666 is 666011466.

It can be written as a sum of positive squares in 2 ways, for example, as 509630625 + 154480041 = 22575^2 + 12429^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 664110666.

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, 16011 + ... + 39806.

Almost surely, 2^664110666 is an apocalyptic number.

664110666 is an abundant number, since it is smaller than the sum of its proper divisors (776998458).

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

664110666 is a wasteful number, since it uses less digits than its factorization.

664110666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56486 (or 56483 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 664110666 is about 25770.3447008378. The cubic root of 664110666 is about 872.4625987585.

The spelling of 664110666 in words is "six hundred sixty-four million, one hundred ten thousand, six hundred sixty-six".