377

This number is a composite.

377 = 2^2 + 3^2 + 5^2 + 7^2 + 11^2 + 13^2, i.e., the sum of squares of the first six primes. [Mizuki]

The largest known Fibonacci number whose digits are all primes. [Capelle]

The smallest Honaker-Fibonacci number. [Gaydos]

The sum of the squares of all primes less than (3+7+7) is 377. Note that the prime sum of the same primes is 37+π(7). [Worrom]