266

266 = 2 x 7 x 19.

266 is 222 in base 11.

266 is a divisor of 11³ - 1.

The palindromic concatenation reflection of 266 (662266) has a prime factorization with only palindromic factors: 662266 = 2 x 11 x 30103.

2,661,653 = 1653² - 266².

The gestation period for humans is about 266 days.

Source: Prime Curios!