18340243504 has 20 divisors (see below), whose sum is σ = 38764605960. Its totient is φ = 8336474240.

The previous prime is 18340243429. The next prime is 18340243507. The reversal of 18340243504 is 40534204381.

It is a self number, because there is not a number n which added to its sum of digits gives 18340243504.

It is not an unprimeable number, because it can be changed into a prime (18340243507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52102789 + ... + 52103140.

It is an arithmetic number, because the mean of its divisors is an integer number (1938230298).

Almost surely, 2^18340243504 is an apocalyptic number.

It is an amenable number.

18340243504 is an abundant number, since it is smaller than the sum of its proper divisors (20424362456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18340243504 is a wasteful number, since it uses less digits than its factorization.

18340243504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104205948 (or 104205942 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

Adding to 18340243504 its reverse (40534204381), we get a palindrome (58874447885).

The spelling of 18340243504 in words is "eighteen billion, three hundred forty million, two hundred forty-three thousand, five hundred four".