9888766665 has 8 divisors (see below), whose sum is σ = 15822026688. Its totient is φ = 5274008880.

The previous prime is 9888766651. The next prime is 9888766691. The reversal of 9888766665 is 5666678889.

9888766665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 9888766665 - 2⁵ = 9888766633 is a prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9888766665.

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, 329625541 + ... + 329625570.

It is an arithmetic number, because the mean of its divisors is an integer number (1977753336).

Almost surely, 2^9888766665 is an apocalyptic number.

It is an amenable number.

9888766665 is a deficient number, since it is larger than the sum of its proper divisors (5933260023).

9888766665 is a wasteful number, since it uses less digits than its factorization.

9888766665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659251119.

The product of its digits is 209018880, while the sum is 69.

The square root of 9888766665 is about 99442.2780561668. The cubic root of 9888766665 is about 2146.4167221042.

The spelling of 9888766665 in words is "nine billion, eight hundred eighty-eight million, seven hundred sixty-six thousand, six hundred sixty-five".