How to read "numeric form string data" without changing into integer data type？

Question

I want to read data and specify the data type at the beginning.

I have csv data look like this, it's data type is "character"：

• Id
• "76561198042769362 "
• "76561198049454009 "
• "76561198066403163 "
• "76561198079071374 "

And when I read data, it gives me this：

f<-read.csv('community_friendship.csv')

• ID
• 1 7.65612e+16
• 2 7.65612e+16
• 3 7.65612e+16
• 4 7.65612e+16
• 5 7.65612e+16

I try to transform it back to character, however, it round the origin data so I can not have people's real ID

as.character(f)

• ID
• "76561198042769360"
• "76561198049454016"
• "76561198066403168"
• "76561198079071376"
• "76561198083602880"

Do anyone know how to read origin data without transform data type？