18218217318320 has 20 divisors (see below), whose sum is σ = 42357355265280. Its totient is φ = 7287286927296.

The previous prime is 18218217318319. The next prime is 18218217318397. The reversal of 18218217318320 is 2381371281281.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113863858160 + ... + 113863858319.

It is an arithmetic number, because the mean of its divisors is an integer number (2117867763264).

Almost surely, 2^{18218217318320} is an apocalyptic number.

18218217318320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18218217318320 is an abundant number, since it is smaller than the sum of its proper divisors (24139137946960).

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

18218217318320 is a wasteful number, since it uses less digits than its factorization.

18218217318320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227727716492 (or 227727716486 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 47.

The spelling of 18218217318320 in words is "eighteen trillion, two hundred eighteen billion, two hundred seventeen million, three hundred eighteen thousand, three hundred twenty".