663217073 has 8 divisors (see below), whose sum is σ = 702471528. Its totient is φ = 623989504.

The previous prime is 663217067. The next prime is 663217091. The reversal of 663217073 is 370712366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 64 + 663217009 = 8^2 + 25753^2 .

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 663217073 - 2⁴ = 663217057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663217003) 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, 67715 + ... + 76887.

It is an arithmetic number, because the mean of its divisors is an integer number (87808941).

Almost surely, 2^663217073 is an apocalyptic number.

It is an amenable number.

663217073 is a deficient number, since it is larger than the sum of its proper divisors (39254455).

663217073 is a wasteful number, since it uses less digits than its factorization.

663217073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13443.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 663217073 is about 25753.0012425737. The cubic root of 663217073 is about 872.0711095848.

The spelling of 663217073 in words is "six hundred sixty-three million, two hundred seventeen thousand, seventy-three".