The largest is really this 39-digit number: 170141183420855150474555134919112130560.
Numbers Held Inexactly on the ZX81 AuthorsFrank O'HaraPublicationSyntaxPub DetailsSyntax/Syntax ZX80 v3 n5Volume: 3 Issue: 5DateMay 1982Pages3Read the articleSee all articles from Syntax/Syntax ZX80 v3 n5 The largest is really this 39-digit number: 170141183420855150474555134919112130560. Tags1982 TS 1000 Tutorial ZX81 PeopleFrank O'Hara