663359509 has 2 divisors, whose sum is σ = 663359510. Its totient is φ = 663359508.

The previous prime is 663359467. The next prime is 663359527. The reversal of 663359509 is 905953366.

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., 625500100 + 37859409 = 25010^2 + 6153^2 .

It is a cyclic number.

It is not a de Polignac number, because 663359509 - 2¹³ = 663351317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663359009) 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, 331679754 + 331679755.

It is an arithmetic number, because the mean of its divisors is an integer number (331679755).

Almost surely, 2^663359509 is an apocalyptic number.

It is an amenable number.

663359509 is a deficient number, since it is larger than the sum of its proper divisors (1).

663359509 is an equidigital number, since it uses as much as digits as its factorization.

663359509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 656100, while the sum is 46.

The square root of 663359509 is about 25755.7665193642. The cubic root of 663359509 is about 872.1335353146.

The spelling of 663359509 in words is "six hundred sixty-three million, three hundred fifty-nine thousand, five hundred nine".