665673612 has 24 divisors (see below), whose sum is σ = 1571954496. Its totient is φ = 219217488.

The previous prime is 665673611. The next prime is 665673629. The reversal of 665673612 is 216376566.

It is not an unprimeable number, because it can be changed into a prime (665673611) 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, 333178 + ... + 335169.

It is an arithmetic number, because the mean of its divisors is an integer number (65498104).

Almost surely, 2^665673612 is an apocalyptic number.

It is an amenable number.

665673612 is an abundant number, since it is smaller than the sum of its proper divisors (906280884).

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

665673612 is a wasteful number, since it uses less digits than its factorization.

665673612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668437 (or 668435 counting only the distinct ones).

The product of its digits is 272160, while the sum is 42.

The square root of 665673612 is about 25800.6513871259. The cubic root of 665673612 is about 873.1464926073.

The spelling of 665673612 in words is "six hundred sixty-five million, six hundred seventy-three thousand, six hundred twelve".