663919903 has 2 divisors, whose sum is σ = 663919904. Its totient is φ = 663919902.

The previous prime is 663919891. The next prime is 663919933. The reversal of 663919903 is 309919366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663919903 - 2¹⁷ = 663788831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663919933) 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, 331959951 + 331959952.

It is an arithmetic number, because the mean of its divisors is an integer number (331959952).

Almost surely, 2^663919903 is an apocalyptic number.

663919903 is a deficient number, since it is larger than the sum of its proper divisors (1).

663919903 is an equidigital number, since it uses as much as digits as its factorization.

663919903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 236196, while the sum is 46.

The square root of 663919903 is about 25766.6432233615. The cubic root of 663919903 is about 872.3790536861.

The spelling of 663919903 in words is "six hundred sixty-three million, nine hundred nineteen thousand, nine hundred three".