998844318643 has 4 divisors (see below), whose sum is σ = 998847493200. Its totient is φ = 998841144088.

The previous prime is 998844318629. The next prime is 998844318683. The reversal of 998844318643 is 346813448899.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 998844318643 - 2²¹ = 998842221491 is a prime.

It is a super-2 number, since 2×998844318643² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998844318683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056055 + ... + 1764352.

It is an arithmetic number, because the mean of its divisors is an integer number (249711873300).

Almost surely, 2^998844318643 is an apocalyptic number.

998844318643 is a deficient number, since it is larger than the sum of its proper divisors (3174557).

998844318643 is a wasteful number, since it uses less digits than its factorization.

998844318643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3174556.

The product of its digits is 143327232, while the sum is 67.

The spelling of 998844318643 in words is "nine hundred ninety-eight billion, eight hundred forty-four million, three hundred eighteen thousand, six hundred forty-three".