MySQL:

FORMAT_BYTES

FORMAT_BYTES(count)

Given a numeric byte count, converts it to human-readable format and
returns a string consisting of a value and a units indicator. The
string contains the number of bytes rounded to 2 decimal places and a
minimum of 3 significant digits. Numbers less than 1024 bytes are
represented as whole numbers and are not rounded.

URL: https://dev.mysql.com/doc/refman/8.0/en/performance-schema-functions.html

Example

mysql> SELECT FORMAT_BYTES(512), FORMAT_BYTES(18446644073709551615);
+-------------------+------------------------------------+
| FORMAT_BYTES(512) | FORMAT_BYTES(18446644073709551615) |
+-------------------+------------------------------------+
| 512 bytes | 16.00 EiB |
+-------------------+------------------------------------+