I was watching some youtube videos about the Bee movie, where you watch the bee movie but every time there's a bee you watch the entire ice age pentology but every time there's a syllable spoken you watch the entire toy story trilogy but every time the color green is in a frame you watch every video every uploaded on youtube but every 10 seconds you watch the every episode of the simpsons. it ended up being 4.2*10^35 seconds. This got me thinking about big numbers in general...I know shuffling a deck of cards can yield a possible 52! different combinations, but what would be the number if you calculated approximately how many times any photon has interacted with a particle in the history of the observable universe up until this point?

I'm sure you could calculate photons per second coming out of a star, average photon bounces per second inside of a star, length of time each photon stays in a star, and multiply it out based on # of stars in the known universe, but i have no clue where i'd start. I asked this on Reddit /r/theydidthemath and someone told me it was impossible but using the simple (albeit huge) numbers i provided in the start of this paragraph, i don't think it'd be impossible to do a rough estimate.