How many letters is in the largest word in the world?

Answer 1

This is the longest word in the world.

ACETYL­SERYL­TYROSYL­ SERYL­ISO­LEUCYL­T HREONYL­SERYL­PROLYL­ SERYL­GLUTAMINYL­PHENY L­ALANYL­VALYL­PHE NYL­ALANYL­LEUCYL­ SERYL­SERYL­VALYL­ TRYPTOPHYL­ALANYL­ASPA RTYL­PROLYL­ISOLEUCYL­ GLUTAMYL­LEUCYL­LEUCYL ­ASPARAGINYL­VALYL­ CYSTEINYL­THREONYL­SER YL­SERYL­LEUCYL­GL YCYL­ASPARAGINYL­GLUTA MINYL­PHENYL­ALANYL­ GLUTAMINYL­THREONYL­GL UTAMINYL­GLUTAMINYL­AL ANYL­ARGINYL­THREONYL­ THREONYL­GLUTAMINYL­VA LYL­GLUTAMINYL­GLUTAMI NYL­PHENYL­ALANYL­ SERYL­GLUTAMINYL­VALYL ­TRYPTOPHYL­LYSYL­ PROLYL­PHENYL­ALANYL­ PROLYL­GLUTAMINYL­SERY L­THREONYL­VALYL­A RGINYL­PHENYL­ALANYL­ PROLYL­GLYCYL­ASPARTYL ­VALYL­TYROSYL­LYS YL­VALYL­TYROSYL­A RGINYL­TYROSYL­ASPARAG INYL­ALANYL­VALYL­ LEUCYL­ASPARTYL­PROLYL ­LEUCYL­ISOLEUCYL­ THREONYL­ALANYL­LEUCYL ­LEUCYL­GLYCYL­THR EONYL­PHENYL­ALANYL­ ASPARTYL­THREONYL­ARGI NYL­ASPARAGINYL­ARGINY L­ISOLEUCYL­ISOLEUCYL­ GLUTAMYL­VALYL­GLUTAMY L­ASPARAGINYL­GLUTAMIN YL­GLUTAMINYL­SERYL­ PROLYL­THREONYL­THREON YL­ALANYL­GLUTAMYL­ THREONYL­LEUCYL­ASPART YL­ALANYL­THREONYL­ ARGINYL­ARGINYL­VALYL­ ASPARTYL­ASPARTYL­ALAN YL­THREONYL­VALYL­ ALANYL­ISOLEUCYL­ARGIN YL­SERYL­ALANYL­AS PARAGINYL­ISOLEUCYL­AS PARAGINYL­LEUCYL­VALYL ­ASPARAGINYL­GLUTAMYL­ LEUCYL­VALYL­ARGINYL­ GLYCYL­THREONYL­GLYCYL ­LEUCYL­TYROSYL­AS PARAGINYL­GLUTAMINYL­A SPARAGINYL­THREONYL­PH ENYL­ALANYL­GLUTAMYL­ SERYL­METHIONYL­SERYL­ GLYCYL­LEUCYL­VALYL­ TRYPTOPHYL­THREONYL­SE RYL­ALANYL­PROLYL­ ALANYL­SERINE = Tobacco Mosaic Virus, Dahlemense Strain.

This word has appeared in the American Chemical Society's Chemical Abstracts and is thus considered by some to be the longest real word.