665245 has 16 divisors (see below), whose sum is σ = 927360. Its totient is φ = 448704.

The previous prime is 665239. The next prime is 665251. The reversal of 665245 is 542566.

665245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (665239) and next prime (665251).

It is a cyclic number.

It is not a de Polignac number, because 665245 - 2⁵ = 665213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2791 + ... + 3019.

It is an arithmetic number, because the mean of its divisors is an integer number (57960).

2⁶⁶⁵²⁴⁵ is an apocalyptic number.

It is an amenable number.

665245 is a deficient number, since it is larger than the sum of its proper divisors (262115).

665245 is a wasteful number, since it uses less digits than its factorization.

665245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324.

The product of its digits is 7200, while the sum is 28.

The square root of 665245 is about 815.6255268198. The cubic root of 665245 is about 87.2959052693.

The spelling of 665245 in words is "six hundred sixty-five thousand, two hundred forty-five".