663444389 has 2 divisors, whose sum is σ = 663444390. Its totient is φ = 663444388.

The previous prime is 663444349. The next prime is 663444437. The reversal of 663444389 is 983444366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400680289 + 262764100 = 20017^2 + 16210^2 .

It is a cyclic number.

It is not a de Polignac number, because 663444389 - 2¹⁶ = 663378853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663444349) 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 as a sum of consecutive naturals, namely, 331722194 + 331722195.

It is an arithmetic number, because the mean of its divisors is an integer number (331722195).

Almost surely, 2^663444389 is an apocalyptic number.

It is an amenable number.

663444389 is a deficient number, since it is larger than the sum of its proper divisors (1).

663444389 is an equidigital number, since it uses as much as digits as its factorization.

663444389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 47.

The square root of 663444389 is about 25757.4142529874. The cubic root of 663444389 is about 872.1707316043.

The spelling of 663444389 in words is "six hundred sixty-three million, four hundred forty-four thousand, three hundred eighty-nine".