Why js expression is not passed to ng-show?

Question

JavaScript

Hello, you need to do validation on the first angular. Everything works except one:

<div ng-show="authForm.password.$touched && authForm.password.$invalid && authForm.password.value.length < 6" class="input__error">Password should be at least six characters</div>

authForm - form name
password - input name
Without this expression, everything works, but I need the user to enter at least 6 characters:
authForm.password.value.length < 6