99999888866665 has 24 divisors (see below), whose sum is σ = 124282461303000. Its totient is φ = 77240062201344.

The previous prime is 99999888866651. The next prime is 99999888866693. The reversal of 99999888866665 is 56666888899999.

It can be written as a sum of positive squares in 12 ways, for example, as 15420763517184 + 84579125349481 = 3926928^2 + 9196691^2 .

It is a de Polignac number, because none of the positive numbers 2^k-99999888866665 is a prime.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333462211 + ... + 333761959.

It is an arithmetic number, because the mean of its divisors is an integer number (5178435887625).

Almost surely, 2^{99999888866665} is an apocalyptic number.

It is an amenable number.

99999888866665 is a deficient number, since it is larger than the sum of its proper divisors (24282572436335).

99999888866665 is a wasteful number, since it uses less digits than its factorization.

99999888866665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379149 (or 379120 counting only the distinct ones).

The product of its digits is 1567283281920, while the sum is 106.

The spelling of 99999888866665 in words is "ninety-nine trillion, nine hundred ninety-nine billion, eight hundred eighty-eight million, eight hundred sixty-six thousand, six hundred sixty-five".