22543671985 has 4 divisors (see below), whose sum is σ = 27052406388. Its totient is φ = 18034937584.

The previous prime is 22543671977. The next prime is 22543672013. The reversal of 22543671985 is 58917634522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58917634522 = 2 ⋅29458817261.

It can be written as a sum of positive squares in 2 ways, for example, as 5981011569 + 16562660416 = 77337^2 + 128696^2 .

It is a cyclic number.

It is not a de Polignac number, because 22543671985 - 2³ = 22543671977 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2254367194 + ... + 2254367203.

It is an arithmetic number, because the mean of its divisors is an integer number (6763101597).

Almost surely, 2^22543671985 is an apocalyptic number.

It is an amenable number.

22543671985 is a deficient number, since it is larger than the sum of its proper divisors (4508734403).

22543671985 is an equidigital number, since it uses as much as digits as its factorization.

22543671985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4508734402.

The product of its digits is 3628800, while the sum is 52.

The spelling of 22543671985 in words is "twenty-two billion, five hundred forty-three million, six hundred seventy-one thousand, nine hundred eighty-five".