663305563 has 2 divisors, whose sum is σ = 663305564. Its totient is φ = 663305562.

The previous prime is 663305551. The next prime is 663305581. The reversal of 663305563 is 365503366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663305563 - 2²¹ = 661208411 is a prime.

It is not a weakly prime, because it can be changed into another prime (663305063) 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, 331652781 + 331652782.

It is an arithmetic number, because the mean of its divisors is an integer number (331652782).

Almost surely, 2^663305563 is an apocalyptic number.

663305563 is a deficient number, since it is larger than the sum of its proper divisors (1).

663305563 is an equidigital number, since it uses as much as digits as its factorization.

663305563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145800, while the sum is 37.

The square root of 663305563 is about 25754.7192374524. The cubic root of 663305563 is about 872.1098933374.

The spelling of 663305563 in words is "six hundred sixty-three million, three hundred five thousand, five hundred sixty-three".