18234111500 has 96 divisors (see below), whose sum is σ = 43589145600. Its totient is φ = 6608376000.

The previous prime is 18234111479. The next prime is 18234111509. The reversal of 18234111500 is 511143281.

It is a self number, because there is not a number n which added to its sum of digits gives 18234111500.

It is not an unprimeable number, because it can be changed into a prime (18234111509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1683101 + ... + 1693899.

It is an arithmetic number, because the mean of its divisors is an integer number (454053600).

Almost surely, 2^18234111500 is an apocalyptic number.

18234111500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18234111500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21794572800).

18234111500 is an abundant number, since it is smaller than the sum of its proper divisors (25355034100).

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

18234111500 is a wasteful number, since it uses less digits than its factorization.

18234111500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11136 (or 11124 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

Adding to 18234111500 its reverse (511143281), we get a palindrome (18745254781).

The spelling of 18234111500 in words is "eighteen billion, two hundred thirty-four million, one hundred eleven thousand, five hundred".