Sixty-four is a specific number that, in most cases, cannot be substituted with any other word. However, there are some synonymous expressions that refer to this number. For example, it is possible to use terms like four dozen, 8 squared, 2 to the power of 6, 16 octal, or 40 hex. Additionally, for some applications, 64 bits can be used as a synonym to sixty-four. In music, 64 is equivalent to semihemidemisemiquaver, which refers to a note that is played for 1/256 of a measure. These synonyms can be useful when you need to avoid repetitions or express the same number in a different way.