18321945403392 has 560 divisors, whose sum is σ = 57813685601760. Its totient is φ = 5766150094848.

The previous prime is 18321945403357. The next prime is 18321945403393. The reversal of 18321945403392 is 29330454912381.

It is a happy number.

18321945403392 is a `hidden beast` number, since 1 + 8 + 3 + 2 + 1 + 9 + 4 + 540 + 3 + 3 + 92 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18321945403393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3946141423 + ... + 3946146065.

Almost surely, 2^{18321945403392} is an apocalyptic number.

18321945403392 is a gapful number since it is divisible by the number (12) 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 18321945403392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28906842800880).

18321945403392 is an abundant number, since it is smaller than the sum of its proper divisors (39491740198368).

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

18321945403392 is an equidigital number, since it uses as much as digits as its factorization.

18321945403392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5013 (or 4980 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 18321945403392 in words is "eighteen trillion, three hundred twenty-one billion, nine hundred forty-five million, four hundred three thousand, three hundred ninety-two".