999998888866666 has 64 divisors (see below), whose sum is σ = 1692226156432896. Its totient is φ = 440154849139200.

The previous prime is 999998888866651. The next prime is 999998888866741. The reversal of 999998888866666 is 666668888899999.

999998888866666 is a strobogrammatic number because it is the same when read upside-down.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 999998888866666.

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 31 ways as a sum of consecutive naturals, for example, 17345356 + ... + 47967271.

It is an arithmetic number, because the mean of its divisors is an integer number (26441033694264).

Almost surely, 2^{999998888866666} is an apocalyptic number.

999998888866666 is a deficient number, since it is larger than the sum of its proper divisors (692227267566230).

999998888866666 is a wasteful number, since it uses less digits than its factorization.

999998888866666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65313007.

The product of its digits is 15045919506432, while the sum is 115.

The spelling of 999998888866666 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-six".