>>722
I think I can memorize up to 11 digits with ease. However, I have a terrible memory for names, so memorizing my phone book is out of question. The most was 16 alphanumeric characters of my email.
Personally, I love adding up all digits or parts of phone numbers together. I even have a weird system of memorizing something by creating a strange rule for digits/numbers and calculating a sum of all digits. It's inexplicable.
When I run out of publicly available numbers or any interesting thoughts, I usually calculate squares of different numbers.
Also, I completely agree that surfaces in public areas are disgusting. I always have a small bottle of antiseptic gel with me.
>>724
What do you like to do with numbers in your free time?