1111666661111 has 2 divisors, whose sum is σ = 1111666661112. Its totient is φ = 1111666661110.

The previous prime is 1111666661087. The next prime is 1111666661113.

It is a happy number.

1111666661111 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1111666661111 - 2²² = 1111662466807 is a prime.

Together with 1111666661113, 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 (1111666661113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555833330555 + 555833330556.

It is an arithmetic number, because the mean of its divisors is an integer number (555833330556).

Almost surely, 2^{1111666661111} is an apocalyptic number.

1111666661111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111666661111 is an equidigital number, since it uses as much as digits as its factorization.

1111666661111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 38.

The spelling of 1111666661111 in words is "one trillion, one hundred eleven billion, six hundred sixty-six million, six hundred sixty-one thousand, one hundred eleven".