665612 has 6 divisors (see below), whose sum is σ = 1164828. Its totient is φ = 332804.

The previous prime is 665603. The next prime is 665617. The reversal of 665612 is 216566.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665612.

It is not an unprimeable number, because it can be changed into a prime (665617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83198 + ... + 83205.

It is an arithmetic number, because the mean of its divisors is an integer number (194138).

2⁶⁶⁵⁶¹² is an apocalyptic number.

It is an amenable number.

665612 is a deficient number, since it is larger than the sum of its proper divisors (499216).

665612 is a wasteful number, since it uses less digits than its factorization.

665612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166407 (or 166405 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 665612 is about 815.8504764968. The cubic root of 665612 is about 87.3119553499.

The spelling of 665612 in words is "six hundred sixty-five thousand, six hundred twelve".