Unvigintisescentillion

An unvigintisescentillion is equal to \(10^{1866}\) in the short scale and \(10^{3726}\) in the long scale by the and 's naming systemConway and Guy. (1995) "The book of Numbers" Copernicus as it is the 621st -illion number.
In the long scale, \(10^{1866}\) is called undecitrecentillion.
==Approximations==
For the short scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{1866}\) (exact) 	\(1\times10^{1866}\) (exact)
Arrow notation 	\(10\uparrow 1866\) (exact) 	\(10\uparrow 1866\) (exact)
Steinhaus-Moser Notation 	661[3] 	662[3]
Chained arrow notation 	\(10\rightarrow 1866\) (exact) 	\(10\rightarrow 1866\) (exact)
Taro's multivariable Ackermann function	A(3,6195) 	A(3,6196)
BEAF & Bird's array notation 	{10,1866} (exact) 	{10,1866} (exact)
Hyper-E notation 	E1866 (exact) 	E1866 (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)(661) 	m(1)(662)
Bashicu matrix system 	(0)(1)[3] 	(0)(1)[4]
Fast-growing hierarchy 	\(f_2(6186)\) 	\(f_2(6187)\)
Hardy hierarchy 	\(H_{\omega^2}(6186)\) 	\(H_{\omega^2}(6187)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega^3+\omega^2 8+\omega 6+6}}(10)\) (exact)	\(g_{\omega^{\omega^3+\omega^2 8+\omega 6+6}}(10)\) (exact)
For the long scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{3726}\) (exact) 	\(1\times10^{3726}\) (exact)
Arrow notation 	\(10\uparrow 3726\) (exact) 	\(10\uparrow 3726\) (exact)
Steinhaus-Moser Notation 	1208[3] 	1209[3]
Chained arrow notation 	\(10\rightarrow 3726\) (exact) 	\(10\rightarrow 3726\) (exact)
Taro's multivariable Ackermann function	A(3,12374) 	A(3,12375)
BEAF & Bird's array notation 	{10,3726} (exact) 	{10,3726} (exact)
Hyper-E notation 	E3726 (exact) 	E3726 (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)(1208) 	m(1)(1209)
Bashicu matrix system 	(0)(1)[3] 	(0)(1)[4]
Fast-growing hierarchy 	\(f_2(12363)\) 	\(f_2(12364)\)
Hardy hierarchy 	\(H_{\omega^2}(12363)\) 	\(H_{\omega^2}(12364)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega^3 3+\omega^2 7+\omega 2+6}}(10)\) (exact)	\(g_{\omega^{\omega^3 3+\omega^2 7+\omega 2+6}}(10)\) (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