SDL_PRIx64 - Man Page

SDL_PRIx64 — A printf-formatting string for a Uint64
value as lower-case hexadecimal.

Defined in SDL3/SDL_stdinc.h

#include "SDL3/SDL.h"

#define SDL_PRIx64 llx"

Use it like this:

SDL_Log("There are %" SDL_PRIx64 " bottles of beer on the wall.", bottles);

This macro is available since SDL 3.2.0.