663091489 has 2 divisors, whose sum is σ = 663091490. Its totient is φ = 663091488.

The previous prime is 663091487. The next prime is 663091493. The reversal of 663091489 is 984190366.

663091489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 526014225 + 137077264 = 22935^2 + 11708^2 .

It is a cyclic number.

It is not a de Polignac number, because 663091489 - 2¹ = 663091487 is a prime.

Together with 663091487, 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 (663091487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331545744 + 331545745.

It is an arithmetic number, because the mean of its divisors is an integer number (331545745).

Almost surely, 2^663091489 is an apocalyptic number.

It is an amenable number.

663091489 is a deficient number, since it is larger than the sum of its proper divisors (1).

663091489 is an equidigital number, since it uses as much as digits as its factorization.

663091489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 663091489 is about 25750.5628870516. The cubic root of 663091489 is about 872.0160622024.

The spelling of 663091489 in words is "six hundred sixty-three million, ninety-one thousand, four hundred eighty-nine".