1998327443905 has 48 divisors (see below), whose sum is σ = 2607228195264. Its totient is φ = 1469680692480.

The previous prime is 1998327443891. The next prime is 1998327443929. The reversal of 1998327443905 is 5093447238991.

It is a de Polignac number, because none of the positive numbers 2^k-1998327443905 is a prime.

It is a super-3 number, since 3×1998327443905³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian 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 47 ways as a sum of consecutive naturals, for example, 432442495 + ... + 432447115.

It is an arithmetic number, because the mean of its divisors is an integer number (54317254068).

Almost surely, 2^{1998327443905} is an apocalyptic number.

It is an amenable number.

1998327443905 is a deficient number, since it is larger than the sum of its proper divisors (608900751359).

1998327443905 is a wasteful number, since it uses less digits than its factorization.

1998327443905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6626 (or 6613 counting only the distinct ones).

The product of its (nonzero) digits is 58786560, while the sum is 64.

The spelling of 1998327443905 in words is "one trillion, nine hundred ninety-eight billion, three hundred twenty-seven million, four hundred forty-three thousand, nine hundred five".