998888899998 has 128 divisors (see below), whose sum is σ = 2211748830720. Its totient is φ = 298242385920.

The previous prime is 998888899991. The next prime is 998888899999. The reversal of 998888899998 is 899998888899.

It is a super-5 number, since 5×998888899998⁵ (a number of 61 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998888899991) 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 63 ways as a sum of consecutive naturals, for example, 966978090 + ... + 966979122.

It is an arithmetic number, because the mean of its divisors is an integer number (17279287740).

Almost surely, 2^998888899998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998888899998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1105874415360).

998888899998 is an abundant number, since it is smaller than the sum of its proper divisors (1212859930722).

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

998888899998 is a wasteful number, since it uses less digits than its factorization.

998888899998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882.

The product of its digits is 139314069504, while the sum is 102.

The spelling of 998888899998 in words is "nine hundred ninety-eight billion, eight hundred eighty-eight million, eight hundred ninety-nine thousand, nine hundred ninety-eight".