Hex #66cadd or rgb(102,202,221) in RGB space is the tint of bluish cian. It has hue angle of 189.58 degrees, value = 87 and saturation = 54. #66cadd can be obtained by mixing 4 colors: 1 drop of red, 1 drop of blue, 5 drops of cyan, 3 drops of white.
Nearest safe hex - #66cccc. Below you can see the block with #66cadd color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66cadd to the mixer and play with it.