989999999999999 has 4 divisors (see below), whose sum is σ = 1048235294117664. Its totient is φ = 931764705882336.

The previous prime is 989999999999993. The next prime is 990000000000017. The reversal of 989999999999999 is 999999999999989.

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 989999999999999 - 2²⁰ = 989999998951423 is a prime.

It is a super-9 number, since 9×989999999999999⁹ (a number of 136 digits) contains 999999999 as substring.

It is a Duffinian number.

989999999999999 is a modest number, since divided by 99999999 gives 9899999 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989999999999993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29117647058807 + ... + 29117647058840.

It is an arithmetic number, because the mean of its divisors is an integer number (262058823529416).

Almost surely, 2^{989999999999999} is an apocalyptic number.

989999999999999 is a deficient number, since it is larger than the sum of its proper divisors (58235294117665).

989999999999999 is a wasteful number, since it uses less digits than its factorization.

989999999999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58235294117664.

The product of its digits is 183014339639688, while the sum is 134.

The spelling of 989999999999999 in words is "nine hundred eighty-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".