# What is the Greatest Common Factor of 155 and 169?

Greatest common factor (GCF) of 155 and 169 is 1.

GCF(155,169) = 1

We will now calculate the prime factors of 155 and 169, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 155 and 169.

GCF Calculator and
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## How to find the GCF of 155 and 169?

We will first find the prime factorization of 155 and 169. After we will calculate the factors of 155 and 169 and find the biggest common factor number .

### Step-1: Prime Factorization of 155

Prime factors of 155 are 5, 31. Prime factorization of 155 in exponential form is:

155 = 51 × 311

### Step-2: Prime Factorization of 169

Prime factors of 169 are 13. Prime factorization of 169 in exponential form is:

169 = 132

### Step-3: Factors of 155

List of positive integer factors of 155 that divides 155 without a remainder.

1, 5, 31

### Step-4: Factors of 169

List of positive integer factors of 169 that divides 155 without a remainder.

1, 13

#### Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 155 and 169. The biggest common factor number is the GCF number.
So the greatest common factor 155 and 169 is 1.

Also check out the Least Common Multiple of 155 and 169