Hex #405555 or rgb(64,85,85) in RGB space is the tint of cyan. It has hue angle of 180.00 degrees, value = 33 and saturation = 25. #405555 can be obtained by mixing 4 colors: 3 drops of magenta, 2 drops of cyan, 3 drops of green, 4 drops of black.
Nearest safe hex - #336666. Below you can see the block with #405555 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #405555 to the mixer and play with it.