9999116666 has 32 divisors (see below), whose sum is σ = 18718801920. Its totient is φ = 3891769200.

The previous prime is 9999116657. The next prime is 9999116707. The reversal of 9999116666 is 6666119999.

9999116666 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9999116599 and 9999116608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119855 + ... + 185373.

It is an arithmetic number, because the mean of its divisors is an integer number (584962560).

Almost surely, 2^9999116666 is an apocalyptic number.

9999116666 is a deficient number, since it is larger than the sum of its proper divisors (8719685254).

9999116666 is a wasteful number, since it uses less digits than its factorization.

9999116666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66530.

The product of its digits is 8503056, while the sum is 62.

The square root of 9999116666 is about 99995.5832324608. The cubic root of 9999116666 is about 2154.3712519835.

The spelling of 9999116666 in words is "nine billion, nine hundred ninety-nine million, one hundred sixteen thousand, six hundred sixty-six".