18013222080 has 1344 divisors, whose sum is σ = 80947077120. Its totient is φ = 3583180800.

The previous prime is 18013222079. The next prime is 18013222093. The reversal of 18013222080 is 8022231081.

It is a tau number, because it is divible by the number of its divisors (1344).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 439346860 + ... + 439346900.

It is an arithmetic number, because the mean of its divisors is an integer number (60228480).

Almost surely, 2^18013222080 is an apocalyptic number.

18013222080 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 18013222080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40473538560).

18013222080 is an abundant number, since it is smaller than the sum of its proper divisors (62933855040).

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

18013222080 is a wasteful number, since it uses less digits than its factorization.

18013222080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

Subtracting from 18013222080 its reverse (8022231081), we obtain a palindrome (9990990999).

The spelling of 18013222080 in words is "eighteen billion, thirteen million, two hundred twenty-two thousand, eighty".