18219544448 has 128 divisors (see below), whose sum is σ = 44682528000. Its totient is φ = 7225085952.

The previous prime is 18219544397. The next prime is 18219544459. The reversal of 18219544448 is 84444591281.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 18219544396 and 18219544405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 719588 + ... + 744476.

It is an arithmetic number, because the mean of its divisors is an integer number (349082250).

Almost surely, 2^18219544448 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 18219544448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22341264000).

18219544448 is an abundant number, since it is smaller than the sum of its proper divisors (26462983552).

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

18219544448 is a wasteful number, since it uses less digits than its factorization.

18219544448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24972 (or 24960 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 50.

The spelling of 18219544448 in words is "eighteen billion, two hundred nineteen million, five hundred forty-four thousand, four hundred forty-eight".