999911111116666 has 32 divisors (see below), whose sum is σ = 1716348994345728. Its totient is φ = 427979498722560.

The previous prime is 999911111116663. The next prime is 999911111116711. The reversal of 999911111116666 is 666611111119999.

999911111116666 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999911111116663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145753186 + ... + 152459218.

It is an arithmetic number, because the mean of its divisors is an integer number (53635906073304).

Almost surely, 2^{999911111116666} is an apocalyptic number.

999911111116666 is a deficient number, since it is larger than the sum of its proper divisors (716437883229062).

999911111116666 is a wasteful number, since it uses less digits than its factorization.

999911111116666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6719806.

The product of its digits is 8503056, while the sum is 67.

The spelling of 999911111116666 in words is "nine hundred ninety-nine trillion, nine hundred eleven billion, one hundred eleven million, one hundred sixteen thousand, six hundred sixty-six".