663217 has 8 divisors (see below), whose sum is σ = 688896. Its totient is φ = 638112.

The previous prime is 663209. The next prime is 663239. The reversal of 663217 is 712366.

663217 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 not a de Polignac number, because 663217 - 2³ = 663209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 663191 and 663200.

It is not an unprimeable number, because it can be changed into a prime (663517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4773 + ... + 4909.

It is an arithmetic number, because the mean of its divisors is an integer number (86112).

2⁶⁶³²¹⁷ is an apocalyptic number.

It is an amenable number.

663217 is a deficient number, since it is larger than the sum of its proper divisors (25679).

663217 is a wasteful number, since it uses less digits than its factorization.

663217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287.

The product of its digits is 1512, while the sum is 25.

The square root of 663217 is about 814.3813602975. The cubic root of 663217 is about 87.2071077589.

The spelling of 663217 in words is "six hundred sixty-three thousand, two hundred seventeen".