18281568834 has 64 divisors (see below), whose sum is σ = 43118542080. Its totient is φ = 5721649920.

The previous prime is 18281568829. The next prime is 18281568871. The reversal of 18281568834 is 43886518281.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 362827 + ... + 410129.

It is an arithmetic number, because the mean of its divisors is an integer number (673727220).

Almost surely, 2^18281568834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18281568834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21559271040).

18281568834 is an abundant number, since it is smaller than the sum of its proper divisors (24836973246).

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

18281568834 is a wasteful number, since it uses less digits than its factorization.

18281568834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47752 (or 47746 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 54.

The spelling of 18281568834 in words is "eighteen billion, two hundred eighty-one million, five hundred sixty-eight thousand, eight hundred thirty-four".