Sexcentillion

A sexcentillion is equal to \(10^{321}\) in the short scale and \(10^{636}\) in the long scale by Conway and Guy's naming systemConway and Guy. (1995) "The book of Numbers" Copernicus as it is the 106th -illion number.
In the long scale, \(10^{321}\) is called tresquinquagintilliard.
==Approximations==
For the short scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{321}\) 	\(1\times10^{321}\)
Arrow notation 	\(10\uparrow 321\) 	\(10\uparrow 321\)
Taro's multivariable Ackermann function	A(3,1063) 	A(3,1064)
BEAF 	{10,321} 	{10,321}
Hyper-E notation 	E321 	E321
Fast-growing hierarchy 	\(f_2(1056)\) 	\(f_2(1057)\)
Hardy hierarchy 	\(H_{\omega^2}(1056)\)	\(H_{\omega^2}(1057)\)
For the long scale:
Notation 	Lower bound 	Upper bound
Scientific notation 	\(1\times10^{636}\) 	\(1\times10^{636}\)
Arrow notation 	\(10\uparrow 636\) 	\(10\uparrow 636\)
Taro's multivariable Ackermann function	A(3,2109) 	A(3,2110)
BEAF 	{10,636} 	{10,636}
Hyper-E notation 	E636 	E636
Fast-growing hierarchy 	\(f_2(2101)\) 	\(f_2(2102)\)
Hardy hierarchy 	\(H_{\omega^2}(2101)\)	\(H_{\omega^2}(2102)\)
== Sources ==
== See also ==
Category:Numbers
Category:Class 2
Category:Illion
Category:Numbers with 101 to 999 digits
Category:Powers of 10 with squarefree exponent
Category:Tier 1 -illion numbers