645 US pints in US customary teaspoons
Result
The conversion result is: 645 US pints is equivalent to 61920 US customary teaspoons.[1]
Conversion formula
How to convert 645 US pints to US customary teaspoons?
We know (by definition) that: 1 uspint ≈ 96 usteaspoon.
We can set up a proportion to solve for the number of US customary teaspoons.
1 uspint / 645 uspint ≈ 96 usteaspoon / x usteaspoon
Now, we cross multiply to solve for our unknown x:
x usteaspoon ≈ (645 uspint / 1 uspint) * 96 usteaspoon → x usteaspoon ≈ 61920 usteaspoon
Conclusion:
645 uspint ≈ 61920 usteaspoon

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US customary teaspoon is equal to 1.61498708010336e-05 times 645 US pints.
It can also be expressed as: 645 US pints is equal to 1 / 1.61498708010336e-05 US customary teaspoons.
Approximation
An approximate numerical result would be: six hundred and forty-five US pints is about sixty-one thousand, nine hundred and twenty US customary teaspoons, or alternatively, a US customary teaspoon is about zero times six hundred and forty-five US pints.
Footnotes
[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).
Results may contain small errors due to the use of floating point arithmetic.