22636105209 has 45 divisors (see below), whose sum is σ = 34434350973. Its totient is φ = 14819018688.

The previous prime is 22636105169. The next prime is 22636105211. The reversal of 22636105209 is 90250163622.

The square root of 22636105209 is 150453.

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

22636105209 is a `hidden beast` number, since 2 + 2 + 636 + 10 + 5 + 2 + 0 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6968075625 + 15668029584 = 83475^2 + 125172^2 .

It is not a de Polignac number, because 22636105209 - 2⁹ = 22636104697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22636105249) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 98847507 + ... + 98847735.

Almost surely, 2^22636105209 is an apocalyptic number.

22636105209 is the 150453-rd square number.

22636105209 is the 75227-th centered octagonal number.

It is an amenable number.

22636105209 is a deficient number, since it is larger than the sum of its proper divisors (11798245764).

22636105209 is an frugal number, since it uses more digits than its factorization.

22636105209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

Multiplying 22636105209 by its sum of digits (36), we get a square (814899787524 = 902718²).

The spelling of 22636105209 in words is "twenty-two billion, six hundred thirty-six million, one hundred five thousand, two hundred nine".