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/Byte#Multiple-byte_units
"the C64 took its name from its 64 kilobytes (65,536 bytes) of RAM"