664404466 has 12 divisors (see below), whose sum is σ = 1095444126. Its totient is φ = 302001920.

The previous prime is 664404397. The next prime is 664404527.

It is a happy number.

664404466 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 513974241 + 150430225 = 22671^2 + 12265^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1372495 + ... + 1372978.

Almost surely, 2^664404466 is an apocalyptic number.

664404466 is a deficient number, since it is larger than the sum of its proper divisors (431039660).

664404466 is a wasteful number, since it uses less digits than its factorization.

664404466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745497 (or 2745486 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The square root of 664404466 is about 25776.0444211287. The cubic root of 664404466 is about 872.5912378214.

The spelling of 664404466 in words is "six hundred sixty-four million, four hundred four thousand, four hundred sixty-six".