11665642111 has 2 divisors, whose sum is σ = 11665642112. Its totient is φ = 11665642110.

The previous prime is 11665642103. The next prime is 11665642117. The reversal of 11665642111 is 11124656611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11665642111 - 2³ = 11665642103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11665642117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5832821055 + 5832821056.

It is an arithmetic number, because the mean of its divisors is an integer number (5832821056).

Almost surely, 2^11665642111 is an apocalyptic number.

11665642111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11665642111 is an equidigital number, since it uses as much as digits as its factorization.

11665642111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The spelling of 11665642111 in words is "eleven billion, six hundred sixty-five million, six hundred forty-two thousand, one hundred eleven".