18388835222 has 4 divisors (see below), whose sum is σ = 27583252836. Its totient is φ = 9194417610.

The previous prime is 18388835221. The next prime is 18388835291. The reversal of 18388835222 is 22253888381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22253888381 = 401 ⋅55495981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18388835221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4597208804 + ... + 4597208807.

It is an arithmetic number, because the mean of its divisors is an integer number (6895813209).

Almost surely, 2^18388835222 is an apocalyptic number.

18388835222 is a deficient number, since it is larger than the sum of its proper divisors (9194417614).

18388835222 is an equidigital number, since it uses as much as digits as its factorization.

18388835222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9194417613.

The product of its digits is 1474560, while the sum is 50.

The spelling of 18388835222 in words is "eighteen billion, three hundred eighty-eight million, eight hundred thirty-five thousand, two hundred twenty-two".