66911018111 has 4 divisors (see below), whose sum is σ = 76469734992. Its totient is φ = 57352301232.

The previous prime is 66911018033. The next prime is 66911018117. The reversal of 66911018111 is 11181011966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66911018111 - 2¹⁰ = 66911017087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66911018117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4779358430 + ... + 4779358443.

It is an arithmetic number, because the mean of its divisors is an integer number (19117433748).

Almost surely, 2^66911018111 is an apocalyptic number.

66911018111 is a deficient number, since it is larger than the sum of its proper divisors (9558716881).

66911018111 is an equidigital number, since it uses as much as digits as its factorization.

66911018111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9558716880.

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 66911018111 in words is "sixty-six billion, nine hundred eleven million, eighteen thousand, one hundred eleven".