173 (the 40th prime)

 
Next prime179
Previous prime167
Octal(255)8
Hexadecimal(AD)16
Prime gap6
24th Sexy prime (the small number)The big number is 179 .
18th Prime of the Form 4n+122 + 132
12th Euler prime number 
13th Sophie Germain prime 
19th Left-truncatable prime