665049904 has 20 divisors (see below), whose sum is σ = 1297072240. Its totient is φ = 330321600.

The previous prime is 665049901. The next prime is 665049937. The reversal of 665049904 is 409940566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (665049901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135219 + ... + 140050.

It is an arithmetic number, because the mean of its divisors is an integer number (64853612).

Almost surely, 2^665049904 is an apocalyptic number.

It is an amenable number.

665049904 is a deficient number, since it is larger than the sum of its proper divisors (632022336).

665049904 is a wasteful number, since it uses less digits than its factorization.

665049904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275428 (or 275422 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 665049904 is about 25788.5614953607. The cubic root of 665049904 is about 872.8737069574.

The spelling of 665049904 in words is "six hundred sixty-five million, forty-nine thousand, nine hundred four".