999998888866665 has 16 divisors (see below), whose sum is σ = 1601415403987200. Its totient is φ = 532860346795392.

The previous prime is 999998888866651. The next prime is 999998888866741. The reversal of 999998888866665 is 566668888899999.

It is not a de Polignac number, because 999998888866665 - 2¹⁴ = 999998888850281 is a prime.

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 (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29524603345 + ... + 29524637214.

It is an arithmetic number, because the mean of its divisors is an integer number (100088462749200).

Almost surely, 2^{999998888866665} is an apocalyptic number.

It is an amenable number.

999998888866665 is a deficient number, since it is larger than the sum of its proper divisors (601416515120535).

999998888866665 is a wasteful number, since it uses less digits than its factorization.

999998888866665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59049241696.

The product of its digits is 12538266255360, while the sum is 114.

The spelling of 999998888866665 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, eight hundred eighty-eight million, eight hundred sixty-six thousand, six hundred sixty-five".