666225 has 60 divisors (see below), whose sum is σ = 1440384. Its totient is φ = 298080.

The previous prime is 666203. The next prime is 666229. The reversal of 666225 is 522666.

It is not a de Polignac number, because 666225 - 2⁹ = 665713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

666225 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666225.

It is not an unprimeable number, because it can be changed into a prime (666229) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 14152 + ... + 14198.

2⁶⁶⁶²²⁵ is an apocalyptic number.

It is an amenable number.

666225 is an abundant number, since it is smaller than the sum of its proper divisors (774159).

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

666225 is a wasteful number, since it uses less digits than its factorization.

666225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 62 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 666225 is about 816.2260716248. The cubic root of 666225 is about 87.3387506432.

The spelling of 666225 in words is "six hundred sixty-six thousand, two hundred twenty-five".