18243324113 has 6 divisors (see below), whose sum is σ = 21221826066. Its totient is φ = 15637134912.

The previous prime is 18243324109. The next prime is 18243324119. The reversal of 18243324113 is 31142334281.

It can be written as a sum of positive squares in only one way, i.e., 16001491009 + 2241833104 = 126497^2 + 47348^2 .

It is not a de Polignac number, because 18243324113 - 2² = 18243324109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18243324113.

It is not an unprimeable number, because it can be changed into a prime (18243324119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 186156320 + ... + 186156417.

It is an arithmetic number, because the mean of its divisors is an integer number (3536971011).

Almost surely, 2^18243324113 is an apocalyptic number.

It is an amenable number.

18243324113 is a deficient number, since it is larger than the sum of its proper divisors (2978501953).

18243324113 is an equidigital number, since it uses as much as digits as its factorization.

18243324113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372312751 (or 372312744 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

Adding to 18243324113 its reverse (31142334281), we get a palindrome (49385658394).

The spelling of 18243324113 in words is "eighteen billion, two hundred forty-three million, three hundred twenty-four thousand, one hundred thirteen".