663717331 has 4 divisors (see below), whose sum is σ = 664616200. Its totient is φ = 662818464.

The previous prime is 663717317. The next prime is 663717401. The reversal of 663717331 is 133717366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133717366 = 2 ⋅66858683.

It is a cyclic number.

It is not a de Polignac number, because 663717331 - 2¹³ = 663709139 is a prime.

It is a super-2 number, since 2×663717331² = 881041390939527122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663717931) 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 3 ways as a sum of consecutive naturals, for example, 448326 + ... + 449803.

It is an arithmetic number, because the mean of its divisors is an integer number (166154050).

Almost surely, 2^663717331 is an apocalyptic number.

663717331 is a deficient number, since it is larger than the sum of its proper divisors (898869).

663717331 is an equidigital number, since it uses as much as digits as its factorization.

663717331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898868.

The product of its digits is 47628, while the sum is 37.

The square root of 663717331 is about 25762.7120272692. The cubic root of 663717331 is about 872.2903193146.

The spelling of 663717331 in words is "six hundred sixty-three million, seven hundred seventeen thousand, three hundred thirty-one".