Unquinquagintasescentillion

An unquinquagintasescentillion is equal to \(10^{1956}\) in the short scale and \(10^{3906}\) in the long scale by the and 's naming systemConway and Guy. (1995) "The book of Numbers" Copernicus as it is the 651st -illion number.
In the long scale, \(10^{1956}\) is called sesvigintitrecentillion.
==Approximations==
For the short scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{1956}\) (exact) 	\(1\times10^{1956}\) (exact)
Arrow notation 	\(10\uparrow 1956\) (exact) 	\(10\uparrow 1956\) (exact)
Steinhaus-Moser Notation 	689[3] 	690[3]
Chained arrow notation 	\(10\rightarrow 1956\) (exact) 	\(10\rightarrow 1956\) (exact)
Taro's multivariable Ackermann function	A(3,6494) 	A(3,6495)
BEAF & Bird's array notation 	{10,1956} (exact) 	{10,1956} (exact)
Hyper-E notation 	E1956 (exact) 	E1956 (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)(689) 	m(1)(690)
Bashicu matrix system 	(0)(1)[3] 	(0)(1)[4]
Fast-growing hierarchy 	\(f_2(6485)\) 	\(f_2(6486)\)
Hardy hierarchy 	\(H_{\omega^2}(6485)\) 	\(H_{\omega^2}(6486)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega^3+\omega^2 9+\omega 5+6}}(10)\) (exact)	\(g_{\omega^{\omega^3+\omega^2 9+\omega 5+6}}(10)\) (exact)
For the long scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{3906}\) (exact) 	\(1\times10^{3906}\) (exact)
Arrow notation 	\(10\uparrow 3906\) (exact) 	\(10\uparrow 3906\) (exact)
Steinhaus-Moser Notation 	1259[3] 	1260[3]
Chained arrow notation 	\(10\rightarrow 3906\) (exact) 	\(10\rightarrow 3906\) (exact)
Taro's multivariable Ackermann function	A(3,12972) 	A(3,12973)
BEAF & Bird's array notation 	{10,3906} (exact) 	{10,3906} (exact)
Hyper-E notation 	E3906 (exact) 	E3906 (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)(1259) 	m(1)(1260)
Bashicu matrix system 	(0)(1)[3] 	(0)(1)[4]
Fast-growing hierarchy 	\(f_2(12961)\) 	\(f_2(12962)\)
Hardy hierarchy 	\(H_{\omega^2}(12961)\) 	\(H_{\omega^2}(12962)\)
Slow-growing hierarchy 	\(g_{\omega^{\omega^3 3+\omega^2 9+6}}(10)\) (exact)	\(g_{\omega^{\omega^3 3+\omega^2 9+6}}(10)\) (exact)
== Sources ==
== See also ==
Category:Numbers
Category:Class 2
Category:Illion
Category:Numbers with 1000 to 1000000 digits
Category:Tier 1 -illion numbers