Quinsexagintasescentillion

A quinsexagintasescentillion is equal to \(10^{1998}\) in the short scale and \(10^{3990}\) in the long scale by the and 's naming systemConway and Guy. (1995) "The book of Numbers" Copernicus as it is the 665th -illion number.
In the long scale, \(10^{1998}\) is called trestrigintatrecentillion.
==Approximations==
For the short scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{1998}\) (exact) 	\(1\times10^{1998}\) (exact)
Arrow notation 	\(10\uparrow 1998\) (exact) 	\(10\uparrow 1998\) (exact)
Steinhaus-Moser Notation 	701[3] 	702[3]
Chained arrow notation 	\(10\rightarrow 1998\) (exact) 	\(10\rightarrow 1998\) (exact)
Taro's multivariable Ackermann function	A(3,6634) 	A(3,6635)
BEAF & Bird's array notation 	{10,1998} (exact) 	{10,1998} (exact)
Hyper-E notation 	E1998 (exact) 	E1998 (exact)
s(n) map 	\(s(1)^3(\lambda x.x+1)(9)\) 	\(s(1)^3(\lambda x.x+1)(10)\)
m(n) map 	m(1)(701) 	m(1)(702)
Bashicu matrix system 	(0)(1)[3] 	(0)(1)[4]
Fast-growing hierarchy 	\(f_2(6624)\) 	\(f_2(6625)\)
Hardy hierarchy 	\(H_{\omega^2}(6624)\) 	\(H_{\omega^2}(6625)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega^3+\omega^2 9+\omega 9+8}}(10)\) (exact)	\(g_{\omega^{\omega^3+\omega^2 9+\omega 9+8}}(10)\) (exact)
For the long scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{3990}\) (exact) 	\(1\times10^{3990}\) (exact)
Arrow notation 	\(10\uparrow 3990\) (exact) 	\(10\uparrow 3990\) (exact)
Steinhaus-Moser Notation 	1283[3] 	1284[3]
Chained arrow notation 	\(10\rightarrow 3990\) (exact) 	\(10\rightarrow 3990\) (exact)
Taro's multivariable Ackermann function	A(3,13251) 	A(3,13252)
BEAF & Bird's array notation 	{10,3990} (exact) 	{10,3990} (exact)
Hyper-E notation 	E3990 (exact) 	E3990 (exact)
s(n) map 	\(s(1)^3(\lambda x.x+1)(10)\) 	\(s(1)^3(\lambda x.x+1)(11)\)
m(n) map 	m(1)(1283) 	m(1)(1284)
Bashicu matrix system 	(0)(1)[3] 	(0)(1)[4]
Fast-growing hierarchy 	\(f_2(13240)\) 	\(f_2(13241)\)
Hardy hierarchy 	\(H_{\omega^2}(13240)\) 	\(H_{\omega^2}(13241)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega^3 3+\omega^2 9+\omega 9}}(10)\) (exact)	\(g_{\omega^{\omega^3 3+\omega^2 9+\omega 9}}(10)\) (exact)
== Sources ==
== See also ==
Category:Numbers
Category:Class 2
Category:Illion
Category:Numbers with 1000 to 1000000 digits
Category:Tier 1 -illion numbers