663486881 has 2 divisors, whose sum is σ = 663486882. Its totient is φ = 663486880.

The previous prime is 663486833. The next prime is 663486883. The reversal of 663486881 is 188684366.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420906256 + 242580625 = 20516^2 + 15575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663486881 is a prime.

It is a super-2 number, since 2×663486881² = 880429682518216322, which contains 22 as substring.

Together with 663486883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (663486883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331743440 + 331743441.

It is an arithmetic number, because the mean of its divisors is an integer number (331743441).

Almost surely, 2^663486881 is an apocalyptic number.

It is an amenable number.

663486881 is a deficient number, since it is larger than the sum of its proper divisors (1).

663486881 is an equidigital number, since it uses as much as digits as its factorization.

663486881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1327104, while the sum is 50.

The square root of 663486881 is about 25758.2390896583. The cubic root of 663486881 is about 872.1893513450.

The spelling of 663486881 in words is "six hundred sixty-three million, four hundred eighty-six thousand, eight hundred eighty-one".