c5/G is the maximum power, c4/G is the maximum force, c3/G is the maximum mass per time, c2/G is the maximum mass per length. All these limits are connected to black holes. (see arxiv.org/abs/hep-th/0210109 and arxiv.org/abs/2112.15418)
Looking at the maximum angular momentum J of (Kerr) black holes of mass M, one has: J ≤ GM2/c. This implies that c/G is the minimum value of M2/J.
Why is c/G a minimum value, in contrast to all the other exponents which are maxima?