12563638481 has 2 divisors, whose sum is σ = 12563638482. Its totient is φ = 12563638480.

The previous prime is 12563638471. The next prime is 12563638511. The reversal of 12563638481 is 18483636521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9679411456 + 2884227025 = 98384^2 + 53705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12563638481 is a prime.

It is a super-2 number, since 2×12563638481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12563638411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6281819240 + 6281819241.

It is an arithmetic number, because the mean of its divisors is an integer number (6281819241).

Almost surely, 2^12563638481 is an apocalyptic number.

It is an amenable number.

12563638481 is a deficient number, since it is larger than the sum of its proper divisors (1).

12563638481 is an equidigital number, since it uses as much as digits as its factorization.

12563638481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 47.

The spelling of 12563638481 in words is "twelve billion, five hundred sixty-three million, six hundred thirty-eight thousand, four hundred eighty-one".