1998331791008 has 96 divisors (see below), whose sum is σ = 4574667686400. Its totient is φ = 841577195520.

The previous prime is 1998331790971. The next prime is 1998331791067. The reversal of 1998331791008 is 8001971338991.

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, 4205918 + ... + 4656866.

It is an arithmetic number, because the mean of its divisors is an integer number (47652788400).

Almost surely, 2^{1998331791008} 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 1998331791008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2287333843200).

1998331791008 is an abundant number, since it is smaller than the sum of its proper divisors (2576335895392).

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

1998331791008 is a wasteful number, since it uses less digits than its factorization.

1998331791008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451310 (or 451302 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 59.

The spelling of 1998331791008 in words is "one trillion, nine hundred ninety-eight billion, three hundred thirty-one million, seven hundred ninety-one thousand, eight".