22186996209 has 81 divisors (see below), whose sum is σ = 38433794529. Its totient is φ = 12297559680.

The previous prime is 22186996177. The next prime is 22186996219. The reversal of 22186996209 is 90269968122.

It is a happy number.

The square root of 22186996209 is 148953.

It is a perfect power (a square), and thus also a powerful number.

22186996209 is a `hidden beast` number, since 2 + 2 + 1 + 8 + 6 + 9 + 9 + 620 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 156125025 + 22030871184 = 12495^2 + 148428^2 .

It is not a de Polignac number, because 22186996209 - 2⁵ = 22186996177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22186996219) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 128248447 + ... + 128248619.

Almost surely, 2^22186996209 is an apocalyptic number.

22186996209 is the 148953-rd square number.

22186996209 is the 74477-th centered octagonal number.

It is an amenable number.

22186996209 is a deficient number, since it is larger than the sum of its proper divisors (16246798320).

22186996209 is an equidigital number, since it uses as much as digits as its factorization.

22186996209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 22186996209 in words is "twenty-two billion, one hundred eighty-six million, nine hundred ninety-six thousand, two hundred nine".