@futurebird You can encode every kind of media content, whether text, images, video, audio, as a single number, provided the number can become as big as it needs to be. Hackers sometimes spend a lot of time finding a large prime number that just happens to encode some forbidden file, like a ZIP file that contains the source code of some DRM-breaking software.
A lot of network security just consists of keeping certain large numbers secret from anybody but their owners.
It is incredible what we can do with numbers. It seems weird that just two thousand years ago, mathematicians spent a lot more time solving geometry puzzles than playing around with numbers.
But all the numbers a computer can compute are finite. You always get a limited number of digits. You can always add more memory for additional digits, but you basically always work with what can be represented by natural numbers. If you want something continuous that can also fully represent irrational numbers like √2 or π, you need an analogue computer, which comes with its own limitations.