Unvigintiquadringentillion

An unvigintiquadringentillion is equal to \(10^{1266}\) in the short scale and \(10^{2526}\) in the long scale by the and 's naming systemConway and Guy. (1995) "The book of Numbers" Copernicus as it is the 421st -illion number.
In the long scale, \(10^{1266}\) is called undeciducentillion.
==Approximations==
For the short scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{1266}\) (exact) 	\(1\times10^{1266}\) (exact)
Arrow notation 	\(10\uparrow 1266\) (exact) 	\(10\uparrow 1266\) (exact)
Steinhaus-Moser Notation 	473[3] 	474[3]
Chained arrow notation 	\(10\rightarrow 1266\) (exact) 	\(10\rightarrow 1266\) (exact)
Taro's multivariable Ackermann function	A(3,4202) 	A(3,4203)
BEAF & Bird's array notation 	{10,1266} (exact) 	{10,1266} (exact)
Hyper-E notation 	E1266 (exact) 	E1266 (exact)
s(n) map 	\(s(1)^3(\lambda x.x+1)(8)\) 	\(s(1)^3(\lambda x.x+1)(9)\)
m(n) map 	m(1)(473) 	m(1)(474)
Bashicu matrix system 	(0)(1)[3] 	(0)(1)[4]
Fast-growing hierarchy 	\(f_2(4193)\) 	\(f_2(4194)\)
Hardy hierarchy 	\(H_{\omega^2}(4193)\) 	\(H_{\omega^2}(4194)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega^3+\omega^2 2+\omega 6+6}}(10)\) (exact)	\(g_{\omega^{\omega^3+\omega^2 2+\omega 6+6}}(10)\) (exact)
For the long scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{2526}\) (exact) 	\(1\times10^{2526}\) (exact)
Arrow notation 	\(10\uparrow 2526\) (exact) 	\(10\uparrow 2526\) (exact)
Steinhaus-Moser Notation 	860[3] 	861[3]
Chained arrow notation 	\(10\rightarrow 2526\) (exact) 	\(10\rightarrow 2526\) (exact)
Taro's multivariable Ackermann function	A(3,8388) 	A(3,8389)
BEAF & Bird's array notation 	{10,2526} (exact) 	{10,2526} (exact)
Hyper-E notation 	E2526 (exact) 	E2526 (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)(860) 	m(1)(861)
Bashicu matrix system 	(0)(1)[3] 	(0)(1)[4]
Fast-growing hierarchy 	\(f_2(8378)\) 	\(f_2(8379)\)
Hardy hierarchy 	\(H_{\omega^2}(8378)\) 	\(H_{\omega^2}(8379)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega^3 2+\omega^2 5+\omega 2+6}}(10)\) (exact)	\(g_{\omega^{\omega^3 2+\omega^2 5+\omega 2+6}}(10)\) (exact)
== Sources ==
== See also ==
Category:Numbers
Category:Class 2
Category:Illion
Category:Numbers with 1000 to 1000000 digits
Category:Powers of 10 with squarefree exponent
Category:Tier 1 -illion numbers