9988888866 has 64 divisors (see below), whose sum is σ = 23209773696. Its totient is φ = 2832358400.

The previous prime is 9988888837. The next prime is 9988888909. The reversal of 9988888866 is 6688888899.

9988888866 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 junction number, because it is equal to n+sod(n) for n = 9988888791 and 9988888800.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168376 + ... + 219836.

It is an arithmetic number, because the mean of its divisors is an integer number (362652714).

Almost surely, 2^9988888866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9988888866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11604886848).

9988888866 is an abundant number, since it is smaller than the sum of its proper divisors (13220884830).

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

9988888866 is a wasteful number, since it uses less digits than its factorization.

9988888866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51667.

The product of its digits is 764411904, while the sum is 78.

The square root of 9988888866 is about 99944.4288892583. The cubic root of 9988888866 is about 2153.6364538974.

The spelling of 9988888866 in words is "nine billion, nine hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred sixty-six".