18218103447720 has 384 divisors, whose sum is σ = 62950514688000. Its totient is φ = 4182438274560.

The previous prime is 18218103447641. The next prime is 18218103447737. The reversal of 18218103447720 is 2774430181281.

It is a self number, because there is not a number n which added to its sum of digits gives 18218103447720.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1581564121 + ... + 1581575639.

It is an arithmetic number, because the mean of its divisors is an integer number (163933632000).

Almost surely, 2^{18218103447720} is an apocalyptic number.

18218103447720 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 18218103447720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31475257344000).

18218103447720 is an abundant number, since it is smaller than the sum of its proper divisors (44732411240280).

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

18218103447720 is a wasteful number, since it uses less digits than its factorization.

18218103447720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14901 (or 14878 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 48.

The spelling of 18218103447720 in words is "eighteen trillion, two hundred eighteen billion, one hundred three million, four hundred forty-seven thousand, seven hundred twenty".