664909466 has 8 divisors (see below), whose sum is σ = 1074084564. Its totient is φ = 306881280.

The previous prime is 664909459. The next prime is 664909501.

It is a happy number.

664909466 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 584430625 + 80478841 = 24175^2 + 8971^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12786695 + ... + 12786746.

Almost surely, 2^664909466 is an apocalyptic number.

664909466 is a deficient number, since it is larger than the sum of its proper divisors (409175098).

664909466 is a wasteful number, since it uses less digits than its factorization.

664909466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25573456.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The square root of 664909466 is about 25785.8384777381. The cubic root of 664909466 is about 872.8122613091.

The spelling of 664909466 in words is "six hundred sixty-four million, nine hundred nine thousand, four hundred sixty-six".