I have hundreds of bitcoin addresses.  I tend to use a new address for every transaction.

No.  I don't have any of them memorized.  There would be no good reason to do so.

i have a QR code on the back of my business cards..
easy to hand out and easy for recipients to scan.. rather then hand typing the lengthy address..

writing out the lengthy address is soo old school. something not really done in the 21st century of camera's or copy&paste.

but the other question you can ask.. does anyone know their entire credit/debit card number off by heart.. i think you will get the same low percentage of people saying yes

i only know like the first characters and the last 5ish characters,i have them in mind incase i accidently pasted the wrong address.
its a good way to check.

I remember at most few letters of addresses i use most, but there was whole lot of them and i never used one that long so i could remember more than that lol. Anyway, best practice would be to we use address only once.

Funny question, it's hard to memorize your own Bitcoin address.
But I believe if you often practice, surely you will be able to memorize it.

No, of course I could not.
That's why copy and paste and backups are for, so no need to memorize things, unless as training in a memorization course

I don't know mine off hand, however I keep what I can recorded on a piece of paper (a habit of excessive amounts of paperwork in my daily job). I also use 15 to 20 addresses per month so it would be near impossible to remember them all. Hell, I can barely keep track of people's names.

I know the first 3 and last 3 characters of my 5-10 most used addresses. There is an incredible number of addresses out there-- might as well use a new one for every transaction

I remember first number. So I'm like others here, who will remember all this numbers, letters.. its a bit difficult. As someone said here before 20 years we had all phone numbers in head, now its problem to remember any number all is memorized. Anyway nice question, I'm curious is anyone here learned his address. I doubt there is such person, but I will watch this topic and check from time to time will someone like that appear.

i have more than 5 different address and to be honest i can't remember all my bitcoin address but I only remember the first 4 or 5 exact characters