# Sum of product of first N natural numbers.

Is there any existing formula or method to calculate the product of of first n natural numbers for extremely large values i.e n! ? I could not find anything on the internet.

Note by Sridhar Thiagarajan
5 years, 3 months ago

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What do u mean sum of product?Can't understand that.

- 5 years, 3 months ago

- 4 years, 7 months ago

If you want a formula to calculate n! then you're stuck with the recursive definition: n! = n * (n-1)! with 0! = 1. You could also use the gamma function with n! = gamma(n +1), but you still have to do all the work.

- 5 years, 3 months ago