Hex #00637d or rgb(0,99,125) in RGB space is the tint of bluish cian. It has hue angle of 192.48 degrees, value = 49 and saturation = 100. #00637d can be obtained by mixing 4 colors: 5 drops of blue, 4 drops of cyan, 1 drop of green, 5 drops of black.
Nearest safe hex - #006666. Below you can see the block with #00637d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #00637d to the mixer and play with it.