11666111 has 2 divisors, whose sum is σ = 11666112. Its totient is φ = 11666110.

The previous prime is 11666059. The next prime is 11666113. The reversal of 11666111 is 11166611.

11666111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (11166611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11666111 - 2⁶ = 11666047 is a prime.

Together with 11666113, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11666113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5833055 + 5833056.

It is an arithmetic number, because the mean of its divisors is an integer number (5833056).

Almost surely, 2^11666111 is an apocalyptic number.

11666111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11666111 is an equidigital number, since it uses as much as digits as its factorization.

11666111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 23.

The square root of 11666111 is about 3415.5689130802. The cubic root of 11666111 is about 226.7994697059.

Subtracting from 11666111 its reverse (11166611), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 11666111 in words is "eleven million, six hundred sixty-six thousand, one hundred eleven".