Unsexagintasescentillion

An unsexagintasescentillion is equal to \(10^{1986}\) in the short scale and \(10^{3966}\) in the long scale by the and 's naming systemConway and Guy. (1995) "The book of Numbers" Copernicus as it is the 661st -illion number.
In the long scale, \(10^{1986}\) is called untrigintatrecentillion.
==Approximations==
For the short scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{1986}\) (exact) 	\(1\times10^{1986}\) (exact)
Arrow notation 	\(10\uparrow 1986\) (exact) 	\(10\uparrow 1986\) (exact)
Steinhaus-Moser Notation 	698[3] 	699[3]
Chained arrow notation 	\(10\rightarrow 1986\) (exact) 	\(10\rightarrow 1986\) (exact)
Taro's multivariable Ackermann function	A(3,6594) 	A(3,6595)
BEAF & Bird's array notation 	{10,1986} (exact) 	{10,1986} (exact)
Hyper-E notation 	E1986 (exact) 	E1986 (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)(698) 	m(1)(699)
Bashicu matrix system 	(0)(1)[3] 	(0)(1)[4]
Fast-growing hierarchy 	\(f_2(6584)\) 	\(f_2(6585)\)
Hardy hierarchy 	\(H_{\omega^2}(6584)\) 	\(H_{\omega^2}(6585)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega^3+\omega^2 9+\omega 8+6}}(10)\) (exact)	\(g_{\omega^{\omega^3+\omega^2 9+\omega 8+6}}(10)\) (exact)
For the long scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{3966}\) (exact) 	\(1\times10^{3966}\) (exact)
Arrow notation 	\(10\uparrow 3966\) (exact) 	\(10\uparrow 3966\) (exact)
Steinhaus-Moser Notation 	1276[3] 	1277[3]
Chained arrow notation 	\(10\rightarrow 3966\) (exact) 	\(10\rightarrow 3966\) (exact)
Taro's multivariable Ackermann function	A(3,13171) 	A(3,13172)
BEAF & Bird's array notation 	{10,3966} (exact) 	{10,3966} (exact)
Hyper-E notation 	E3966 (exact) 	E3966 (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)(1276) 	m(1)(1277)
Bashicu matrix system 	(0)(1)[3] 	(0)(1)[4]
Fast-growing hierarchy 	\(f_2(13161)\) 	\(f_2(13162)\)
Hardy hierarchy 	\(H_{\omega^2}(13161)\) 	\(H_{\omega^2}(13162)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega^3 3+\omega^2 9+\omega 6+6}}(10)\) (exact)	\(g_{\omega^{\omega^3 3+\omega^2 9+\omega 6+6}}(10)\) (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