660065 has 8 divisors (see below), whose sum is σ = 905280. Its totient is φ = 452592.

The previous prime is 660061. The next prime is 660067. The reversal of 660065 is 560066.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 660065 - 2² = 660061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660065.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660065.

It is not an unprimeable number, because it can be changed into a prime (660061) 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 7 ways as a sum of consecutive naturals, for example, 9395 + ... + 9464.

It is an arithmetic number, because the mean of its divisors is an integer number (113160).

2⁶⁶⁰⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

660065 is a deficient number, since it is larger than the sum of its proper divisors (245215).

660065 is a wasteful number, since it uses less digits than its factorization.

660065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18871.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 660065 is about 812.4438442132. The cubic root of 660065 is about 87.0687350411.

Subtracting from 660065 its reverse (560066), we obtain a palindrome (99999).

The spelling of 660065 in words is "six hundred sixty thousand, sixty-five".