Hex #00645f or rgb(0,100,95) in RGB space is the tint of cyan. It has hue angle of 177.00 degrees, value = 39 and saturation = 100. #00645f can be obtained by mixing 3 colors: 5 drops of blue, 3 drops of green, 1 drop of black.
Nearest safe hex - #006666. Below you can see the block with #00645f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #00645f to the mixer and play with it.