Hex #66a9dd or rgb(102,169,221) in RGB space is the tint of blue. It has hue angle of 206.22 degrees, value = 87 and saturation = 54. #66a9dd can be obtained by mixing 4 colors: 1 drop of magenta, 3 drops of blue, 3 drops of cyan, 3 drops of white.
Nearest safe hex - #6699cc. Below you can see the block with #66a9dd color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a9dd to the mixer and play with it.