665345612 has 6 divisors (see below), whose sum is σ = 1164354828. Its totient is φ = 332672804.

The previous prime is 665345599. The next prime is 665345621. The reversal of 665345612 is 216543566.

It is a happy number.

665345612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83168198 + ... + 83168205.

It is an arithmetic number, because the mean of its divisors is an integer number (194059138).

Almost surely, 2^665345612 is an apocalyptic number.

It is an amenable number.

665345612 is a deficient number, since it is larger than the sum of its proper divisors (499009216).

665345612 is a wasteful number, since it uses less digits than its factorization.

665345612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166336407 (or 166336405 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 665345612 is about 25794.2941752629. The cubic root of 665345612 is about 873.0030594014.

The spelling of 665345612 in words is "six hundred sixty-five million, three hundred forty-five thousand, six hundred twelve".