665598012 has 24 divisors (see below), whose sum is σ = 1620587136. Its totient is φ = 212219568.

The previous prime is 665597971. The next prime is 665598019. The reversal of 665598012 is 210895566.

665598012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665598019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1205518 + ... + 1206069.

It is an arithmetic number, because the mean of its divisors is an integer number (67524464).

Almost surely, 2^665598012 is an apocalyptic number.

It is an amenable number.

665598012 is an abundant number, since it is smaller than the sum of its proper divisors (954989124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665598012 is a wasteful number, since it uses less digits than its factorization.

665598012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2411617 (or 2411615 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 665598012 is about 25799.1862662372. The cubic root of 665598012 is about 873.1134371816.

The spelling of 665598012 in words is "six hundred sixty-five million, five hundred ninety-eight thousand, twelve".