9999886666 has 16 divisors (see below), whose sum is σ = 18701087040. Its totient is φ = 3896059680.

The previous prime is 9999886657. The next prime is 9999886667. The reversal of 9999886666 is 6666889999.

9999886666 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 = 9999886592 and 9999886601.

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 7 ways as a sum of consecutive naturals, for example, 32467011 + ... + 32467318.

It is an arithmetic number, because the mean of its divisors is an integer number (1168817940).

Almost surely, 2^9999886666 is an apocalyptic number.

9999886666 is a deficient number, since it is larger than the sum of its proper divisors (8701200374).

9999886666 is a wasteful number, since it uses less digits than its factorization.

9999886666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64934349.

The product of its digits is 544195584, while the sum is 76.

The square root of 9999886666 is about 99999.4333283944. The cubic root of 9999886666 is about 2154.4265509778.

The spelling of 9999886666 in words is "nine billion, nine hundred ninety-nine million, eight hundred eighty-six thousand, six hundred sixty-six".