1998548749824 has 160 divisors (see below), whose sum is σ = 5811848482176. Its totient is φ = 605249003520.

The previous prime is 1998548749801. The next prime is 1998548749831. The reversal of 1998548749824 is 4289478458991.

It is a self number, because there is not a number n which added to its sum of digits gives 1998548749824.

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, 28130154 + ... + 28201110.

Almost surely, 2^{1998548749824} 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 1998548749824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2905924241088).

1998548749824 is an abundant number, since it is smaller than the sum of its proper divisors (3813299732352).

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

1998548749824 is a wasteful number, since it uses less digits than its factorization.

1998548749824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72656 (or 72640 counting only the distinct ones).

The product of its digits is 1672151040, while the sum is 78.

The spelling of 1998548749824 in words is "one trillion, nine hundred ninety-eight billion, five hundred forty-eight million, seven hundred forty-nine thousand, eight hundred twenty-four".