665912 has 32 divisors (see below), whose sum is σ = 1419600. Its totient is φ = 290304.

The previous prime is 665897. The next prime is 665921. The reversal of 665912 is 219566.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1808 + ... + 2144.

2⁶⁶⁵⁹¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (709800).

665912 is an abundant number, since it is smaller than the sum of its proper divisors (753688).

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

665912 is a wasteful number, since it uses less digits than its factorization.

665912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375 (or 371 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 665912 is about 816.0343130041. The cubic root of 665912 is about 87.3250709249.

The spelling of 665912 in words is "six hundred sixty-five thousand, nine hundred twelve".