This number is a composite.
765 = 401 + 263 + 89 + 7 + 5. Its reversal is the smallest number which is sum of different primes using all the ten digits. [Capelle]
765 = 401 + 263 + 89 + 7 + 5. Its reversal is the smallest
number which is sum of different primes using all the ten
digits. [Capelle]