266550011111 has 4 divisors (see below), whose sum is σ = 269761457112. Its totient is φ = 263338565112.

The previous prime is 266550011017. The next prime is 266550011113. The reversal of 266550011111 is 111110055662.

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 266550011111 - 2²⁶ = 266482902247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266550011113) 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 in 3 ways as a sum of consecutive naturals, for example, 1605722876 + ... + 1605723041.

It is an arithmetic number, because the mean of its divisors is an integer number (67440364278).

Almost surely, 2^266550011111 is an apocalyptic number.

266550011111 is a deficient number, since it is larger than the sum of its proper divisors (3211446001).

266550011111 is an equidigital number, since it uses as much as digits as its factorization.

266550011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211446000.

The product of its (nonzero) digits is 1800, while the sum is 29.

Adding to 266550011111 its reverse (111110055662), we get a palindrome (377660066773).

The spelling of 266550011111 in words is "two hundred sixty-six billion, five hundred fifty million, eleven thousand, one hundred eleven".