18281118258 has 160 divisors (see below), whose sum is σ = 45181825920. Its totient is φ = 5490270720.

The previous prime is 18281118241. The next prime is 18281118259. The reversal of 18281118258 is 85281118281.

It is a happy number.

18281118258 is a `hidden beast` number, since 1 + 8 + 281 + 118 + 258 = 666.

It is not an unprimeable number, because it can be changed into a prime (18281118259) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 20749978 + ... + 20750858.

It is an arithmetic number, because the mean of its divisors is an integer number (282386412).

Almost surely, 2^18281118258 is an apocalyptic number.

18281118258 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18281118258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22590912960).

18281118258 is an abundant number, since it is smaller than the sum of its proper divisors (26900707662).

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

18281118258 is a wasteful number, since it uses less digits than its factorization.

18281118258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134 (or 1125 counting only the distinct ones).

The product of its digits is 81920, while the sum is 45.

The spelling of 18281118258 in words is "eighteen billion, two hundred eighty-one million, one hundred eighteen thousand, two hundred fifty-eight".