266222111 has 4 divisors (see below), whose sum is σ = 267089592. Its totient is φ = 265354632.

The previous prime is 266222087. The next prime is 266222119. The reversal of 266222111 is 111222662.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111222662 = 2 ⋅55611331.

It is a cyclic number.

It is not a de Polignac number, because 266222111 - 2²² = 262027807 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 (266222119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433280 + ... + 433893.

It is an arithmetic number, because the mean of its divisors is an integer number (66772398).

Almost surely, 2^266222111 is an apocalyptic number.

266222111 is a deficient number, since it is larger than the sum of its proper divisors (867481).

266222111 is an equidigital number, since it uses as much as digits as its factorization.

266222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867480.

The product of its digits is 576, while the sum is 23.

The square root of 266222111 is about 16316.3142590476. The cubic root of 266222111 is about 643.3017126455.

Adding to 266222111 its reverse (111222662), we get a palindrome (377444773).

The spelling of 266222111 in words is "two hundred sixty-six million, two hundred twenty-two thousand, one hundred eleven".