166225225 has 12 divisors (see below), whose sum is σ = 210009996. Its totient is φ = 130470080.

The previous prime is 166225219. The next prime is 166225237. The reversal of 166225225 is 522522661.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1565001 + 164660224 = 1251^2 + 12832^2 .

It is not a de Polignac number, because 166225225 - 2⁷ = 166225097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61402 + ... + 64051.

It is an arithmetic number, because the mean of its divisors is an integer number (17500833).

Almost surely, 2^166225225 is an apocalyptic number.

It is an amenable number.

166225225 is a deficient number, since it is larger than the sum of its proper divisors (43784771).

166225225 is a wasteful number, since it uses less digits than its factorization.

166225225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125516 (or 125511 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 166225225 is about 12892.8361891401. The cubic root of 166225225 is about 549.8349091281.

Adding to 166225225 its reverse (522522661), we get a palindrome (688747886).

The spelling of 166225225 in words is "one hundred sixty-six million, two hundred twenty-five thousand, two hundred twenty-five".