qnorm of a p value very close to 1

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qnorm of a p value very close to 1

iamhealthy
Hi, I have a p value (1-5.73e-18). The qnorm(1-5.73e-18) returns Inf. Is it right and how to solve it?
I thought qnorm(1-5.73e-18) should return a large positive value.