18399810249984 has 144 divisors (see below), whose sum is σ = 49204958609408. Its totient is φ = 6103952971776.

The previous prime is 18399810249983. The next prime is 18399810250007. The reversal of 18399810249984 is 48994201899381.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18399810249983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137196849 + ... + 137330895.

Almost surely, 2^{18399810249984} 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 18399810249984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24602479304704).

18399810249984 is an abundant number, since it is smaller than the sum of its proper divisors (30805148359424).

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

18399810249984 is a wasteful number, since it uses less digits than its factorization.

18399810249984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134920 (or 134906 counting only the distinct ones).

The product of its (nonzero) digits is 322486272, while the sum is 75.

The spelling of 18399810249984 in words is "eighteen trillion, three hundred ninety-nine billion, eight hundred ten million, two hundred forty-nine thousand, nine hundred eighty-four".