660045 has 16 divisors (see below), whose sum is σ = 1071360. Its totient is φ = 346944.

The previous prime is 660029. The next prime is 660047. The reversal of 660045 is 540066.

It is not a de Polignac number, because 660045 - 2⁴ = 660029 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 907 + ... + 1463.

It is an arithmetic number, because the mean of its divisors is an integer number (66960).

2⁶⁶⁰⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

660045 is a deficient number, since it is larger than the sum of its proper divisors (411315).

660045 is a wasteful number, since it uses less digits than its factorization.

660045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 660045 is about 812.4315355770. The cubic root of 660045 is about 87.0678556367.

Adding to 660045 its sum of digits (21), we get a palindrome (660066).

The spelling of 660045 in words is "six hundred sixty thousand, forty-five".