Hex #66aad5 or rgb(102,170,213) in RGB space is the tint of blue. It has hue angle of 203.24 degrees, value = 84 and saturation = 52. #66aad5 can be obtained by mixing 4 colors: 2 drops of magenta, 5 drops of cyan, 2 drops of white, 1 drop of black.
Nearest safe hex - #6699cc. Below you can see the block with #66aad5 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66aad5 to the mixer and play with it.