Hex #668d8e or rgb(102,141,142) in RGB space is the tint of cyan. It has hue angle of 181.50 degrees, value = 56 and saturation = 28. #668d8e can be obtained by mixing 4 colors: 5 drops of magenta, 4 drops of cyan, 5 drops of green, 1 drop of white.
Nearest safe hex - #669999. Below you can see the block with #668d8e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668d8e to the mixer and play with it.