How many digits does a Googol have?

A googol has 101 digits in total — that's the digit 1 followed by 100 zeros.

How Many Zeros in a Googol?

A googol is written as:
10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
That's: A 1 followed by 100 zeros Written as: 10¹⁰⁰ (scientific notation).

So the answer is: There are 100 zeros in a googol.

What Is a Googol?

A googol is a mathematical concept — not something you'll find in your bank account or on a calculator. It was invented in 1938 by 9-year-old Milton Sirotta, the nephew of mathematician Edward Kasner, who wanted a name for a very, very large number.

A googol is:

1 followed by 100 zeros
Much larger than the number of atoms in the observable universe
Used to illustrate the concept of infinity vs. unimaginably large but finite numbers
It's not practical in the real world — it's mostly used for fun, theory, and teaching scale.

How to to Remember 100 Zeros

It's hard to picture 100 of anything — let alone zeros — but here are some fun ways to remember it:

Break it into 10 groups of 10 zeros:
→ 0000000000
→ 0000000000
→ 0000000000
→ … (×10)

Visualizing a Googol

Number of Atoms in the Universe?
Estimated at 10⁷⁸ to 10⁸² atoms in the observable universe — still far less than a googol.
Time Comparison
If you counted 1 number per second...
→ It would take over 3.2 × 10⁹² years to count to a googol
→ That's way longer than the age of the universe (which is ~13.8 billion years)
Paper & Ink
If you wrote a googol out by hand (100 zeros), using large print, it would stretch dozens of meters long. You'd need a scroll.

Googol vs. Other Giant Numbers

Name	Scientific Notation	Zeros
Quadrillion	10¹⁵	15
Quintillion	10¹⁸	18
Octillion	10²⁷	27
Nonillion	10³⁰	30
Decillion	10³³	33
Googol	10¹⁰⁰	100

Googol

A googol has 100 zeros
Scientific notation: 10¹⁰⁰
Bigger than all atoms in the universe
Used mostly for teaching and theory — not practical math

A googol is a reminder of how vast numbers can be — stretching our imagination far beyond everyday counting. Though we don't use googol in daily life, it represents the infinite potential of numbers and the sheer scope of the mathematical universe.