665112 has 64 divisors (see below), whose sum is σ = 1969920. Its totient is φ = 183168.

The previous prime is 665111. The next prime is 665113. The reversal of 665112 is 211566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (665111) and next prime (665113).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665112.

It is not an unprimeable number, because it can be changed into a prime (665111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6163 + ... + 6269.

It is an arithmetic number, because the mean of its divisors is an integer number (30780).

2⁶⁶⁵¹¹² 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 665112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (984960).

665112 is an abundant number, since it is smaller than the sum of its proper divisors (1304808).

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

665112 is a wasteful number, since it uses less digits than its factorization.

665112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 156 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 665112 is about 815.5439902298. The cubic root of 665112 is about 87.2900872978.

Adding to 665112 its reverse (211566), we get a palindrome (876678).

It can be divided in two parts, 665 and 112, that added together give a palindrome (777).

The spelling of 665112 in words is "six hundred sixty-five thousand, one hundred twelve".