9999988885 has 4 divisors (see below), whose sum is σ = 11999986668. Its totient is φ = 7999991104.

The previous prime is 9999988871. The next prime is 9999988903. The reversal of 9999988885 is 5888899999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6778064241 + 3221924644 = 82329^2 + 56762^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999988885 - 2¹¹ = 9999986837 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9999988799 and 9999988808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999998884 + ... + 999998893.

It is an arithmetic number, because the mean of its divisors is an integer number (2999996667).

Almost surely, 2^9999988885 is an apocalyptic number.

It is an amenable number.

9999988885 is a deficient number, since it is larger than the sum of its proper divisors (1999997783).

9999988885 is a wasteful number, since it uses less digits than its factorization.

9999988885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999997782.

The product of its digits is 1209323520, while the sum is 82.

The square root of 9999988885 is about 99999.9444249846. The cubic root of 9999988885 is about 2154.4338918135.

The spelling of 9999988885 in words is "nine billion, nine hundred ninety-nine million, nine hundred eighty-eight thousand, eight hundred eighty-five".