12631866109 has 2 divisors, whose sum is σ = 12631866110. Its totient is φ = 12631866108.

The previous prime is 12631866101. The next prime is 12631866127. The reversal of 12631866109 is 90166813621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11881654009 + 750212100 = 109003^2 + 27390^2 .

It is a cyclic number.

It is not a de Polignac number, because 12631866109 - 2³ = 12631866101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12631866101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6315933054 + 6315933055.

It is an arithmetic number, because the mean of its divisors is an integer number (6315933055).

Almost surely, 2^12631866109 is an apocalyptic number.

It is an amenable number.

12631866109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12631866109 is an equidigital number, since it uses as much as digits as its factorization.

12631866109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 12631866109 in words is "twelve billion, six hundred thirty-one million, eight hundred sixty-six thousand, one hundred nine".