18204344203 has 4 divisors (see below), whose sum is σ = 18832080240. Its totient is φ = 17576608168.

The previous prime is 18204344173. The next prime is 18204344251. The reversal of 18204344203 is 30244340281.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30244340281 = 173909².

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18204344203 is a prime.

It is a super-2 number, since 2×18204344203² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18204344503) 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, 313867975 + ... + 313868032.

It is an arithmetic number, because the mean of its divisors is an integer number (4708020060).

Almost surely, 2^18204344203 is an apocalyptic number.

18204344203 is a deficient number, since it is larger than the sum of its proper divisors (627736037).

18204344203 is an equidigital number, since it uses as much as digits as its factorization.

18204344203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627736036.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 18204344203 its reverse (30244340281), we get a palindrome (48448684484).

The spelling of 18204344203 in words is "eighteen billion, two hundred four million, three hundred forty-four thousand, two hundred three".