998817718900 has 18 divisors (see below), whose sum is σ = 2167434450230. Its totient is φ = 399527087520.

The previous prime is 998817718867. The next prime is 998817718909. The reversal of 998817718900 is 9817718899.

It can be written as a sum of positive squares in 3 ways, for example, as 320349208036 + 678468510864 = 565994^2 + 823692^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998817718909) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 4994088495 + ... + 4994088694.

Almost surely, 2^998817718900 is an apocalyptic number.

It is an amenable number.

998817718900 is an abundant number, since it is smaller than the sum of its proper divisors (1168616731330).

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

998817718900 is a wasteful number, since it uses less digits than its factorization.

998817718900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9988177203 (or 9988177196 counting only the distinct ones).

The product of its (nonzero) digits is 18289152, while the sum is 67.

The spelling of 998817718900 in words is "nine hundred ninety-eight billion, eight hundred seventeen million, seven hundred eighteen thousand, nine hundred".