9988888888866 has 16 divisors (see below), whose sum is σ = 20218473896544. Its totient is φ = 3289513609824.

The previous prime is 9988888888859. The next prime is 9988888888871. The reversal of 9988888888866 is 6688888888899.

It is a super-2 number, since 2×9988888888866² (a number of 27 digits) contains 22 as substring.

9988888888866 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10029004411 + ... + 10029005406.

It is an arithmetic number, because the mean of its divisors is an integer number (1263654618534).

Almost surely, 2^{9988888888866} is an apocalyptic number.

9988888888866 is an abundant number, since it is smaller than the sum of its proper divisors (10229585007678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9988888888866 is a wasteful number, since it uses less digits than its factorization.

9988888888866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20058009905.

The product of its digits is 391378894848, while the sum is 102.

The spelling of 9988888888866 in words is "nine trillion, nine hundred eighty-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred sixty-six".