Hex #55636a or rgb(85,99,106) in RGB space is the tint of bluish cian. It has hue angle of 200.00 degrees, value = 42 and saturation = 20. #55636a can be obtained by mixing 3 colors: 4 drops of red, 5 drops of cyan, 3 drops of black.
Nearest safe hex - #666666. Below you can see the block with #55636a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55636a to the mixer and play with it.