Equilibrium Constant (reverse reaction and stoichiometry)

If for the equilibrium \(\ce{A B}\), equilibrium constant = \(K_c\), then equilibrium constant for equilibrium \(\ce{B A}\) is

If for the equilibrium \(\ce{A B}\), equilibrium constant = 0.001, then equilibrium constant for equilibrium \(\ce{B A}\) is

If for the equilibrium \(\ce{A B}\), equilibrium constant = \(K_c\), then equilibrium constant for equilibrium \(\ce{nA nB}\) is

If for the equilibrium \(\ce{A B}\), equilibrium constant = 12, then equilibrium constant for equilibrium \(\ce{2A 2B}\) is

If for the equilibrium \(\ce{A B}\), equilibrium constant = \(K_c\), then equilibrium constant for equilibrium \(\ce{nB nA}\) is

If for the equilibrium \(\ce{2SO2(g) + O2(g) <=> 2SO3(g)}\), equilibrium constant at 500 K is = \(2.5 \times 10^{10}\), then equilibrium constant for equilibrium \(\ce{4SO2(g) + 2O2(g) <=> 4SO3(g)}\) is ______ \(\times 10^{18}\). (Nearest integer)