12223243618 has 4 divisors (see below), whose sum is σ = 18334865430. Its totient is φ = 6111621808.

The previous prime is 12223243607. The next prime is 12223243619. The reversal of 12223243618 is 81634232221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81634232221 = 16927 ⋅4822723.

It can be written as a sum of positive squares in only one way, i.e., 11495485089 + 727758529 = 107217^2 + 26977^2 .

It is not an unprimeable number, because it can be changed into a prime (12223243619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3055810903 + ... + 3055810906.

Almost surely, 2^12223243618 is an apocalyptic number.

12223243618 is a deficient number, since it is larger than the sum of its proper divisors (6111621812).

12223243618 is an equidigital number, since it uses as much as digits as its factorization.

12223243618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6111621811.

The product of its digits is 27648, while the sum is 34.

Adding to 12223243618 its reverse (81634232221), we get a palindrome (93857475839).

The spelling of 12223243618 in words is "twelve billion, two hundred twenty-three million, two hundred forty-three thousand, six hundred eighteen".