99999888866666 has 16 divisors (see below), whose sum is σ = 157894816030560. Its totient is φ = 47368292011920.

The previous prime is 99999888866651. The next prime is 99999888866693. The reversal of 99999888866666 is 66666888899999.

99999888866666 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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26904545 + ... + 30394971.

It is an arithmetic number, because the mean of its divisors is an integer number (9868426001910).

Almost surely, 2^{99999888866666} is an apocalyptic number.

99999888866666 is a deficient number, since it is larger than the sum of its proper divisors (57894927163894).

99999888866666 is a wasteful number, since it uses less digits than its factorization.

99999888866666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4244389.

The product of its digits is 1880739938304, while the sum is 107.

The spelling of 99999888866666 in words is "ninety-nine trillion, nine hundred ninety-nine billion, eight hundred eighty-eight million, eight hundred sixty-six thousand, six hundred sixty-six".