9998888866 has 8 divisors (see below), whose sum is σ = 15007590684. Its totient is φ = 4996358640.

The previous prime is 9998888863. The next prime is 9998888869. The reversal of 9998888866 is 6688888999.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9998888863) and next prime (9998888869).

It can be written as a sum of positive squares in 2 ways, for example, as 9971021025 + 27867841 = 99855^2 + 5279^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9998888863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1538845 + ... + 1545328.

Almost surely, 2^9998888866 is an apocalyptic number.

9998888866 is a deficient number, since it is larger than the sum of its proper divisors (5008701818).

9998888866 is a wasteful number, since it uses less digits than its factorization.

9998888866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3085796.

The product of its digits is 859963392, while the sum is 79.

The square root of 9998888866 is about 99994.4441756641. Note that the first 3 decimals coincide. The cubic root of 9998888866 is about 2154.3548915551.

The spelling of 9998888866 in words is "nine billion, nine hundred ninety-eight million, eight hundred eighty-eight thousand, eight hundred sixty-six".