663631559 has 2 divisors, whose sum is σ = 663631560. Its totient is φ = 663631558.

The previous prime is 663631543. The next prime is 663631571. The reversal of 663631559 is 955136366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663631559 - 2⁴ = 663631543 is a prime.

It is a super-2 number, since 2×663631559² = 880813692201540962, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663631589) 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, 331815779 + 331815780.

It is an arithmetic number, because the mean of its divisors is an integer number (331815780).

Almost surely, 2^663631559 is an apocalyptic number.

663631559 is a deficient number, since it is larger than the sum of its proper divisors (1).

663631559 is an equidigital number, since it uses as much as digits as its factorization.

663631559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 437400, while the sum is 44.

The square root of 663631559 is about 25761.0473195482. The cubic root of 663631559 is about 872.2527424201.

The spelling of 663631559 in words is "six hundred sixty-three million, six hundred thirty-one thousand, five hundred fifty-nine".