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The exatetrofaxul is equal to petatetrofaxul!2 or ((((((200!2)!2)!2)!2)!2)!2)!2 in Hyperfactorial array notation.The term was coined by Lawrence Hollom.[1]

### Etymology

The name of this number is based on SI prefix "exa-" and the number "tetrofaxul".

### Approximations in other notations

Notation Approximation
Hyper-E notation $$\textrm{E}10\#10\#197\#7$$
Up-arrow notation $$10 \uparrow\uparrow\uparrow 10 \uparrow\uparrow\uparrow 10 \uparrow\uparrow\uparrow 10 \uparrow\uparrow\uparrow 10 \uparrow\uparrow\uparrow 10 \uparrow\uparrow\uparrow 10 \uparrow\uparrow\uparrow 198$$
Chained arrow notation $$10 \rightarrow (10 \rightarrow (10 \rightarrow (10 \rightarrow (10 \rightarrow (10 \rightarrow (10 \rightarrow 198 \rightarrow 3) \rightarrow 3) \rightarrow 3) \rightarrow 3) \rightarrow 3) \rightarrow 3)\rightarrow 3$$
BEAF $$\{10,\{10,\{10,\{10,\{10,\{10,\{10,198,3\},3\},3\},3\},3\},3\},3\}$$
Fast-growing hierarchy $$f_4(f_4(f_4(f_4(f_4(f_4(f_4(200))))))$$
Hardy hierarchy $$H_{(\omega^4)7}(200)$$
Slow-growing hierarchy $$g_{\zeta_{\zeta_{\zeta_{\zeta_{\zeta_{\zeta_{\zeta_{0}}}}}}}}(200)$$