22638740185 has 4 divisors (see below), whose sum is σ = 27166488228. Its totient is φ = 18110992144.

The previous prime is 22638740143. The next prime is 22638740197. The reversal of 22638740185 is 58104783622.

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 12690473104 + 9948267081 = 112652^2 + 99741^2 .

It is a cyclic number.

It is not a de Polignac number, because 22638740185 - 2⁷ = 22638740057 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, 2263874014 + ... + 2263874023.

It is an arithmetic number, because the mean of its divisors is an integer number (6791622057).

Almost surely, 2^22638740185 is an apocalyptic number.

It is an amenable number.

22638740185 is a deficient number, since it is larger than the sum of its proper divisors (4527748043).

22638740185 is an equidigital number, since it uses as much as digits as its factorization.

22638740185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4527748042.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 22638740185 in words is "twenty-two billion, six hundred thirty-eight million, seven hundred forty thousand, one hundred eighty-five".