22187898809 has 4 divisors (see below), whose sum is σ = 22200703716. Its totient is φ = 22175093904.

The previous prime is 22187898767. The next prime is 22187898833. The reversal of 22187898809 is 90889878122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18333972409 + 3853926400 = 135403^2 + 62080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22187898809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22187898899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6399854 + ... + 6403319.

It is an arithmetic number, because the mean of its divisors is an integer number (5550175929).

Almost surely, 2^22187898809 is an apocalyptic number.

It is an amenable number.

22187898809 is a deficient number, since it is larger than the sum of its proper divisors (12804907).

22187898809 is a wasteful number, since it uses less digits than its factorization.

22187898809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12804906.

The product of its (nonzero) digits is 9289728, while the sum is 62.

The spelling of 22187898809 in words is "twenty-two billion, one hundred eighty-seven million, eight hundred ninety-eight thousand, eight hundred nine".