663927717 has 8 divisors (see below), whose sum is σ = 888121696. Its totient is φ = 441176112.

The previous prime is 663927709. The next prime is 663927731. The reversal of 663927717 is 717729366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 663927717 - 2³ = 663927709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663927757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359518 + ... + 361359.

It is an arithmetic number, because the mean of its divisors is an integer number (111015212).

Almost surely, 2^663927717 is an apocalyptic number.

It is an amenable number.

663927717 is a deficient number, since it is larger than the sum of its proper divisors (224193979).

663927717 is a wasteful number, since it uses less digits than its factorization.

663927717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721187.

The product of its digits is 666792, while the sum is 48.

The square root of 663927717 is about 25766.7948530662. The cubic root of 663927717 is about 872.3824761588.

The spelling of 663927717 in words is "six hundred sixty-three million, nine hundred twenty-seven thousand, seven hundred seventeen".