9999886665 has 16 divisors (see below), whose sum is σ = 16105781376. Its totient is φ = 5297952000.

The previous prime is 9999886657. The next prime is 9999886667. The reversal of 9999886665 is 5666889999.

It is not a de Polignac number, because 9999886665 - 2³ = 9999886657 is a prime.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9999886667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2205216 + ... + 2209745.

It is an arithmetic number, because the mean of its divisors is an integer number (1006611336).

Almost surely, 2^9999886665 is an apocalyptic number.

It is an amenable number.

9999886665 is a deficient number, since it is larger than the sum of its proper divisors (6105894711).

9999886665 is a wasteful number, since it uses less digits than its factorization.

9999886665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4415120.

The product of its digits is 453496320, while the sum is 75.

The square root of 9999886665 is about 99999.4333233944. The cubic root of 9999886665 is about 2154.4265509059.

The spelling of 9999886665 in words is "nine billion, nine hundred ninety-nine million, eight hundred eighty-six thousand, six hundred sixty-five".