Megaenormatrixul is equal to Kiloenormatrixul![200(2)200(2)200(2)200], using Hyperfactorial array notation. The term was coined by Lawrence Hollom.

### Etymology

The name of this number is based on SI prefix "mega-" and the number "Enormatrixul".

### Approximations

Notation Approximation
Bird's array notation $$\{200,4,201[1[1\neg4]200[1\neg4]200[1\neg4]200]2\}$$
Hierarchical Hyper-Nested Array Notation $$\{200,4,201[1[1/3\sim2]200[1/3\sim2]200[1/3\sim2]200]2\}$$
BEAF $$\{200,4,201(\{X,\{X,\{X,199X,1,1,4\} \\ +199X,1,1,3\}+199X,1,1,2\})2\}$$
Fast-growing hierarchy (using this system of FSes) $$f_{\varphi(1,0,0,\varphi(2,0,0,\varphi(3,0,0,198)+199)+199)+199}^3(200)$$
Hardy hierarchy $$H_{\varphi(1,0,0,\varphi(2,0,0,\varphi(3,0,0,198)+199)+199)\omega^{199}3}(200)$$
Slow-growing hierarchy $$g_{\vartheta(\varphi(1,0,0,\varphi(2,0,0,\varphi(3,0,0,\Omega+199)+199)+199)+200)}(3)$$

### Sources

1. Lawrence Hollom's large numbers site
2. Using particular notation $$\{a,b (A) 2\} = A \&\ a$$ with prime b.