666779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-666779 is a prime.
It is a Duffinian number.
It is a plaindrome in base 10.
2666779 is an apocalyptic number.
666779 is a wasteful number, since it uses less digits than its factorization.
666779 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 325.
The square root of 666779 is about 816.5653678671. The cubic root of 666779 is about 87.3629528083.
The spelling of 666779 in words is "six hundred sixty-six thousand, seven hundred seventy-nine".