Because of irregularities in definition and usage of the kilobyte, the exact number could be any one of the following:
A name is not in common usage for 1024 times an yottabyte.
To clarify the meaning(1) above, the International Electrotechnical Commission (IEC), a standards body, in 1997 proposed short unions of the International System of Units (SI) prefixes with the word "binary." They did not provide a name for this number, although, it would probably be yobibyte. This naming convention has not been widely accepted.
links: http://www.quinion.com/words/turnsofphrase/tp-kib1.htm