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This depends directly upon the mass of the star, and to a smaller extent, composition.

Let's use the Sun, for example

It masses 1.989e+30 kg, or 1,989,000,000,000,000,000,000,000,000,000 kg.

About 90% of the Sun's mass is protons (in the form of Hydrogen.). There is some Helium, Oxygen and other elements in the Sun, but on average, these only make up about 20% of the Sun's mass and they are just under 50% protons.

Assuming 90% protons, the Sun then contains 1.79e+30 kg of protons. Weight of protons = 1 gram per mole (a mole = 6.02e+23),

So, the sun has about 1.0775e+57 protons.

In longhand, that's

1,077,500,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

This number is pronounced 1.0775 Octodecillion. I didn't make this name up - see

http://en.wikipedia.org/wiki/Octodecillion

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17y ago

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