18015821082 has 72 divisors (see below), whose sum is σ = 45480588192. Its totient is φ = 5139061200.

The previous prime is 18015821081. The next prime is 18015821101. The reversal of 18015821082 is 28012851081.

It is not an unprimeable number, because it can be changed into a prime (18015821081) 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 35 ways as a sum of consecutive naturals, for example, 540357 + ... + 572727.

It is an arithmetic number, because the mean of its divisors is an integer number (631674836).

Almost surely, 2^18015821082 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18015821082, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22740294096).

18015821082 is an abundant number, since it is smaller than the sum of its proper divisors (27464767110).

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

18015821082 is a wasteful number, since it uses less digits than its factorization.

18015821082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33024 (or 33014 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 36.

The spelling of 18015821082 in words is "eighteen billion, fifteen million, eight hundred twenty-one thousand, eighty-two".