18501440000 has 400 divisors, whose sum is σ = 51772802400. Its totient is φ = 6561792000.

The previous prime is 18501439991. The next prime is 18501440033. The reversal of 18501440000 is 4410581.

It is a tau number, because it is divible by the number of its divisors (400).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 103359911 + ... + 103360089.

It is an arithmetic number, because the mean of its divisors is an integer number (129432006).

Almost surely, 2^18501440000 is an apocalyptic number.

18501440000 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 18501440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25886401200).

18501440000 is an abundant number, since it is smaller than the sum of its proper divisors (33271362400).

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

18501440000 is an equidigital number, since it uses as much as digits as its factorization.

18501440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

Adding to 18501440000 its reverse (4410581), we get a palindrome (18505850581).

The spelling of 18501440000 in words is "eighteen billion, five hundred one million, four hundred forty thousand".