The Commdore 64 has 64 kibibytes.

https://en.wikipedia.org/wiki/Byte#Multiple-byte_units

"the C64 took its name from its 64 kilobytes (65,536 bytes) of RAM"

https://en.wikipedia.org/wiki/Commodore_64

It has 64 kilobytes. The definition of kilobyte and megabyte (and I presume gigabyte, among people who could afford caring about them) were universally agreed to be binary.