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A 256-bit register can store 2<sup>256</sup> different values. The range of [[integer]] values that can be stored in 256 bits depends on the [[Integer (computer science)#Value and representation|integer representation]] used.
The maximum value of an unsigned 256-bit integer is 2<sup>256</sup> − 1, written in decimal as 115,{{Zwsp}}792,{{Zwsp}}089,{{Zwsp}}237,{{Zwsp}}316,{{Zwsp}}195,{{Zwsp}}423,{{Zwsp}}570,{{Zwsp}}985,{{Zwsp}}008,{{Zwsp}}687,{{Zwsp}}907,{{Zwsp}}853,{{Zwsp}}269,{{Zwsp}}984,{{Zwsp}}665,{{Zwsp}}640,{{Zwsp}}564,{{Zwsp}}039,{{Zwsp}}457,{{Zwsp}}584,{{Zwsp}}007,{{Zwsp}}913,{{Zwsp}}129,{{Zwsp}}639,{{Zwsp}}935 or approximately as 1.1579 x 10<sup>77</sup>.
256-bit processors could be used for addressing directly up to 2<sup>256</sup> bytes. Already 2<sup>128</sup> ([[128-bit]]) would greatly exceed the total data stored on Earth as of 2010, which has been estimated to be around 1.2 [[zettabyte]]s (over 2<sup>70</sup> bytes).<ref>{{cite web|url=https://www.datacenterknowledge.com/archives/2010/05/04/digital-universe-nears-a-zettabyte/|title=Digital Universe nears a Zettabyte|last=Miller|first=Rich|date=4 May 2010|website=Data Center Knowledge|archive-url=https://web.archive.org/web/20100506235633/https://www.datacenterknowledge.com/archives/2010/05/04/digital-universe-nears-a-zettabyte/|archive-date=6 May 2010|url-status=live|access-date=16 September 2010}}</ref>
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[[Category:Data unit]]
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