12712636861 has 2 divisors, whose sum is σ = 12712636862. Its totient is φ = 12712636860.

The previous prime is 12712636759. The next prime is 12712636901. The reversal of 12712636861 is 16863621721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12635108836 + 77528025 = 112406^2 + 8805^2 .

It is a cyclic number.

It is not a de Polignac number, because 12712636861 - 2⁷ = 12712636733 is a prime.

It is a super-2 number, since 2×12712636861² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12712606861) 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, 6356318430 + 6356318431.

It is an arithmetic number, because the mean of its divisors is an integer number (6356318431).

Almost surely, 2^12712636861 is an apocalyptic number.

It is an amenable number.

12712636861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12712636861 is an equidigital number, since it uses as much as digits as its factorization.

12712636861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The spelling of 12712636861 in words is "twelve billion, seven hundred twelve million, six hundred thirty-six thousand, eight hundred sixty-one".