18993365448 has 96 divisors (see below), whose sum is σ = 49430904480. Its totient is φ = 6081158400.

The previous prime is 18993365441. The next prime is 18993365459. The reversal of 18993365448 is 84456339981.

It is a junction number, because it is equal to n+sod(n) for n = 18993365391 and 18993365400.

It is not an unprimeable number, because it can be changed into a prime (18993365441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3156763 + ... + 3162773.

It is an arithmetic number, because the mean of its divisors is an integer number (514905255).

Almost surely, 2^18993365448 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 18993365448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24715452240).

18993365448 is an abundant number, since it is smaller than the sum of its proper divisors (30437539032).

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

18993365448 is a wasteful number, since it uses less digits than its factorization.

18993365448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6219 (or 6184 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 60.

The spelling of 18993365448 in words is "eighteen billion, nine hundred ninety-three million, three hundred sixty-five thousand, four hundred forty-eight".