One.
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Additive identity: zero. Multiplicative identity: one.
The multiplicative identity of a number leaves that number unchanged under multiplication. Thus the multiplicative identity of any number is 1.
It is 1, as it is for all complex numbers - which includes real numbers.
It isa natural numberan integera rational numbera real numbera complex numberIt is also the multiplicative identity of each of the above sets of numbers.
Let m be a whole number, then the multiplicative inverse of m is a number n such that mn=1 since 1 is the multiplicative identity. There is only one choice for n, it is 1/m since m(1/m)=1