999888888665 has 16 divisors (see below), whose sum is σ = 1200772641600. Its totient is φ = 799307359680.

The previous prime is 999888888619. The next prime is 999888888673. The reversal of 999888888665 is 566888888999.

It is a de Polignac number, because none of the positive numbers 2^k-999888888665 is a prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 43868402 + ... + 43891188.

It is an arithmetic number, because the mean of its divisors is an integer number (75048290100).

Almost surely, 2^999888888665 is an apocalyptic number.

It is an amenable number.

999888888665 is a deficient number, since it is larger than the sum of its proper divisors (200883752935).

999888888665 is a wasteful number, since it uses less digits than its factorization.

999888888665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29032.

The product of its digits is 34398535680, while the sum is 92.

The spelling of 999888888665 in words is "nine hundred ninety-nine billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, six hundred sixty-five".