Because of irregularities in definition and usage of the kilobyte, the exact number could be any one of the following:
A yottabyte (280 bytes) is about 2.01 moles of bytes.
A nonabyte is 1024 times a 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" (see Binary prefix). They did not provide a name for this number, although, it would probably be yobibyte. This naming convention has not been widely accepted.