988991199889 has 16 divisors (see below), whose sum is σ = 1235602206720. Its totient is φ = 769033607760.

The previous prime is 988991199871. The next prime is 988991199899.

988991199889 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 988991199889 - 2¹¹ = 988991197841 is a prime.

It is a super-2 number, since 2×988991199889² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (988991199899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13370259 + ... + 13444024.

It is an arithmetic number, because the mean of its divisors is an integer number (77225137920).

Almost surely, 2^988991199889 is an apocalyptic number.

It is an amenable number.

988991199889 is a deficient number, since it is larger than the sum of its proper divisors (246611006831).

988991199889 is a wasteful number, since it uses less digits than its factorization.

988991199889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26814780.

The product of its digits is 2176782336, while the sum is 88.

The spelling of 988991199889 in words is "nine hundred eighty-eight billion, nine hundred ninety-one million, one hundred ninety-nine thousand, eight hundred eighty-nine".