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A primo-vigesimo-centillion is equal to 10366 in America, or 10726 in France and Germany.[1][2] Like most illion numbers, it is part of an extended system of names. It is part of a naming scheme first proposed by Professor Henkle in 1904 and subsequently popularized in 1968 in an article by Dmitri Borgmann. In Henkles scheme the latin ordinals represent their corresponding values, while the cardinals represent multipliers to be applied primarily to the milli- prefix.

Professor Henkles system is notable for being the earliest known attempt to extend the zillion series to the millionth member. It may also have served as the impetus and blue print later systems, including the popular Conway & Guy naming scheme.

This number is also called cenunvigintillion.[3][4]

It is pronounced like this.

### ApproximationsEdit

For short scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{366}$$
Arrow notation $$10\uparrow366$$
Steinhaus-Moser Notation 165[3] 166[3]
Copy notation 9[366] 1[367]
Taro's multivariable Ackermann function A(3,1212) A(3,1213)
Pound-Star Notation #*((232))*12 #*((233))*12
BEAF {10,366}
Hyper-E notation E366
Bashicu matrix system (0)(0)(0)(0)(0)(0)(0)[723] (0)(0)(0)(0)(0)(0)(0)[724]
Hyperfactorial array notation 196! 197!
Fast-growing hierarchy $$f_2(1205)$$ $$f_2(1206)$$
Hardy hierarchy $$H_{\omega^2}(1205)$$ $$H_{\omega^2}(1206)$$
Slow-growing hierarchy $$g_{\omega^{\omega^23+\omega6+6}}(10)$$

For long scale:

Notation Lower bound Upper bound
Scientific notation $$1\times10^{726}$$
Arrow notation $$10\uparrow726$$
Steinhaus-Moser Notation 294[3] 295[3]
Copy notation 9[726] 1[727]
Taro's multivariable Ackermann function A(3,2408) A(3,2409)
Pound-Star Notation #*((1086))*16 #*((1087))*16
BEAF {10,726}
Hyper-E notation E726
Bashicu matrix system (0)(1)[8] (0)(1)[9]
Hyperfactorial array notation 344! 345!
Fast-growing hierarchy $$f_2(2400)$$ $$f_2(2401)$$
Hardy hierarchy $$H_{\omega^2}(2400)$$ $$H_{\omega^2}(2401)$$
Slow-growing hierarchy $$g_{\omega^{\omega^27+\omega2+6}}(10)$$

### See also Edit

Main article: -illion
1–9: million · billion · trillion · quadr · quint · sext · sept · oct · non
10–19: decillion · undec · duodec · tredec · quattuordec · quindec · sexdec · septendec · octodec · novemdec
20–29: vigintillion · unvigint · duovigint · trevigint · quattuorvigint · quinvigint · sexvigint · septenvigint · octovigint · novemvigint
30–39: trigintillion (un- · duo- · tre- · quattuor- · quin- · sex- · septen- · octo- · novem-)
40–49: quadragintillion (un- · duo- · tre- · quattuor- · quin- · sex- · septen- · octo- · novem-)
50–59: quinquagintillion (un- · duo- · tre- · quattuor- · quin- · sex- · septen- · octo- · novem-)
60–69: sexagintillion (un- · duo- · tre- · quattuor- · quin- · sex- · septen- · octo- · novem-)
70–79: septuagintillion (un- · duo- · tre- · quattuor- · quin- · sex- · septen- · octo- · novem-)
80–89: octogintillion (un- · duo- · tre- · quattuor- · quin- · sex- · septen- · octo- · novem-)
90–99: nonagintillion (un- · duo- · tre- · quattuor- · quin- · sex- · septen- · octo- · novem-)
100–900: centillion · primo-vigesimo-cent · ducent · trecent · duotrigintatrecent · quadringent · quingent · sescent · septuagintisescent · septingent · octingent · nongent
1000–1024: millillion · dumill · trimill · quadrimill · quinmill · sexmill · septimill · octimill · nonimill · myr · centimill · micr · nan · pic · femt · att · zept · yoct