998218351984 has 80 divisors (see below), whose sum is σ = 2253007084032. Its totient is φ = 419556743424.

The previous prime is 998218351859. The next prime is 998218352059. The reversal of 998218351984 is 489153812899.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14348227 + ... + 14417629.

Almost surely, 2^998218351984 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 998218351984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1126503542016).

998218351984 is an abundant number, since it is smaller than the sum of its proper divisors (1254788732048).

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

998218351984 is a wasteful number, since it uses less digits than its factorization.

998218351984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71894 (or 71888 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 67.

The spelling of 998218351984 in words is "nine hundred ninety-eight billion, two hundred eighteen million, three hundred fifty-one thousand, nine hundred eighty-four".