There are many ways of remembering long numbers. It is easier to remember words than numbers, so most of the methods I know replace numbers by words. For example, remember texts where the length of each word is a number. It takes practice to generate such texts. Use this app when out of ideas. Enter a number into the search line and see what comes out.
The link to this app doesn’t work anymore. Do you have access to another one that you enjoy using or recommend?
When you press the link you get some “error” page.
Please follow the instruction as-is: ignore the warning you get, insert your number in the search line and see what the search engine comes with.