664673066 has 4 divisors (see below), whose sum is σ = 997009602. Its totient is φ = 332336532.

The previous prime is 664673041. The next prime is 664673071. The reversal of 664673066 is 660376466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 636805225 + 27867841 = 25235^2 + 5279^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166168265 + ... + 166168268.

Almost surely, 2^664673066 is an apocalyptic number.

664673066 is a deficient number, since it is larger than the sum of its proper divisors (332336536).

664673066 is a wasteful number, since it uses less digits than its factorization.

664673066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332336535.

The product of its (nonzero) digits is 653184, while the sum is 44.

The square root of 664673066 is about 25781.2541587875. The cubic root of 664673066 is about 872.7088099939.

The spelling of 664673066 in words is "six hundred sixty-four million, six hundred seventy-three thousand, sixty-six".