22166225 has 12 divisors (see below), whose sum is σ = 27582684. Its totient is φ = 17670720.

The previous prime is 22166201. The next prime is 22166233. The reversal of 22166225 is 52266122.

It can be written as a sum of positive squares in 6 ways, for example, as 1817104 + 20349121 = 1348^2 + 4511^2 .

It is not a de Polignac number, because 22166225 - 2⁶ = 22166161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22166194 and 22166203.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6527 + ... + 9323.

It is an arithmetic number, because the mean of its divisors is an integer number (2298557).

Almost surely, 2^22166225 is an apocalyptic number.

22166225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22166225 is a deficient number, since it is larger than the sum of its proper divisors (5416459).

22166225 is a wasteful number, since it uses less digits than its factorization.

22166225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124 (or 3119 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 22166225 is about 4708.1020592166. The cubic root of 22166225 is about 280.9078737015.

The spelling of 22166225 in words is "twenty-two million, one hundred sixty-six thousand, two hundred twenty-five".