22016111809 has 4 divisors (see below), whose sum is σ = 22039811460. Its totient is φ = 21992412160.

The previous prime is 22016111779. The next prime is 22016111833. The reversal of 22016111809 is 90811161022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90811161022 = 2 ⋅45405580511.

It can be written as a sum of positive squares in 2 ways, for example, as 5290380225 + 16725731584 = 72735^2 + 129328^2 .

It is a cyclic number.

It is not a de Polignac number, because 22016111809 - 2⁹ = 22016111297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22016111839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11848432 + ... + 11850289.

It is an arithmetic number, because the mean of its divisors is an integer number (5509952865).

Almost surely, 2^22016111809 is an apocalyptic number.

It is an amenable number.

22016111809 is a deficient number, since it is larger than the sum of its proper divisors (23699651).

22016111809 is an equidigital number, since it uses as much as digits as its factorization.

22016111809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23699650.

The product of its (nonzero) digits is 1728, while the sum is 31.

The spelling of 22016111809 in words is "twenty-two billion, sixteen million, one hundred eleven thousand, eight hundred nine".