18399278720000 has 880 divisors, whose sum is σ = 50394109522944. Its totient is φ = 6690816000000.

The previous prime is 18399278719999. The next prime is 18399278720021. The reversal of 18399278720000 is 2787299381.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 27835519670 + ... + 27835520330.

Almost surely, 2^{18399278720000} is an apocalyptic number.

18399278720000 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 18399278720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25197054761472).

18399278720000 is an abundant number, since it is smaller than the sum of its proper divisors (31994830802944).

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

18399278720000 is an equidigital number, since it uses as much as digits as its factorization.

18399278720000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 18399278720000 in words is "eighteen trillion, three hundred ninety-nine billion, two hundred seventy-eight million, seven hundred twenty thousand".