One measure of knottedness is the number of crossing changes we have to make in a diagram to obtain the unknot. For the cinquefoil we need two changes. Here is a first. The unknotting number of a knot is the smallest number of crossing changes needed to obtain the unknot from some diagram of the knot. The trefoil has unknotting number 1.
Unknotting number is hard to calculate and remains unknown for many knots.
This knot has 10 crossings. It cannot be drawn with fewer, so it has crossing number 10. However to unknot this diagram we have to change 3 crossings. Here is a different picture of the same knot with 14 crossings. Our knot therefore has unknotting number 2, even though this degree of knottedness does not arise in the simplest picture of it.