1166

1166 is a natural number that follows 1165 and precedes 1167. It is even and composite. Its prime factorization is 1166 = 2 × 11 × 53, a product of three distinct primes, making it squarefree. The divisors of 1166 are 1, 2, 11, 22, 53, 106, 583, and 1166. The sum of all divisors is 1944, so the sum of proper divisors is 778, which means that 1166 is a deficient number in the sense of divisor sums.

In various numeral systems, 1166 is written as follows: in decimal it is 1166; in binary it is 10010001110; in octal it is 2216; in hexadecimal it is 0x48E. In Roman numerals, 1166 is written as MCLXVI.

As a calendar year, 1166 CE falls in the mid-12th century, during the High Middle Ages. At that time the Julian calendar was in use in Europe, and the year would have been associated with the political, religious, and social dynamics of the medieval world. Specific events for that year vary by region and are part of broader historical narratives rather than a single global milestone.