Tetraplo ekatommyriaplekatomyriakis ekatommyrio

The tetraplo ekatommyriaplekatomyriakis ekatommyrio is equal to f(g(f(g(f(g(f(6000000)))))) where f(x) = \(10^{3\times+3}\) and g(x) = \(10^{6x}\). It is approximately equal to E6,000,000#8 = \(10^{3\times10^{6\times10^{3\times10^{6\times10^{3\times10^{6\times10^{3\times10^{6000000}+3}}+3}}+3}}+3}\)