665045312 has 28 divisors (see below), whose sum is σ = 1325491380. Its totient is φ = 331063296.

The previous prime is 665045309. The next prime is 665045317. The reversal of 665045312 is 213540566.

It can be written as a sum of positive squares in 2 ways, for example, as 513656896 + 151388416 = 22664^2 + 12304^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665045317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8033 + ... + 37344.

Almost surely, 2^665045312 is an apocalyptic number.

It is an amenable number.

665045312 is a deficient number, since it is larger than the sum of its proper divisors (660446068).

665045312 is a wasteful number, since it uses less digits than its factorization.

665045312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45618 (or 45608 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 665045312 is about 25788.4724634865. The cubic root of 665045312 is about 872.8716979626.

Adding to 665045312 its reverse (213540566), we get a palindrome (878585878).

The spelling of 665045312 in words is "six hundred sixty-five million, forty-five thousand, three hundred twelve".