18321667287472 has 80 divisors (see below), whose sum is σ = 37888278968160. Its totient is φ = 8557572519936.

The previous prime is 18321667287463. The next prime is 18321667287541. The reversal of 18321667287472 is 27478276612381.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86820678 + ... + 87031450.

It is an arithmetic number, because the mean of its divisors is an integer number (473603487102).

Almost surely, 2^{18321667287472} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18321667287472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18944139484080).

18321667287472 is an abundant number, since it is smaller than the sum of its proper divisors (19566611680688).

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

18321667287472 is a wasteful number, since it uses less digits than its factorization.

18321667287472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214790 (or 214784 counting only the distinct ones).

The product of its digits is 75866112, while the sum is 64.

The spelling of 18321667287472 in words is "eighteen trillion, three hundred twenty-one billion, six hundred sixty-seven million, two hundred eighty-seven thousand, four hundred seventy-two".