12642156677 has 2 divisors, whose sum is σ = 12642156678. Its totient is φ = 12642156676.

The previous prime is 12642156629. The next prime is 12642156689. The reversal of 12642156677 is 77665124621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9515222116 + 3126934561 = 97546^2 + 55919^2 .

It is a cyclic number.

It is not a de Polignac number, because 12642156677 - 2⁸ = 12642156421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12642156697) 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, 6321078338 + 6321078339.

It is an arithmetic number, because the mean of its divisors is an integer number (6321078339).

Almost surely, 2^12642156677 is an apocalyptic number.

It is an amenable number.

12642156677 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642156677 is an equidigital number, since it uses as much as digits as its factorization.

12642156677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 47.

The spelling of 12642156677 in words is "twelve billion, six hundred forty-two million, one hundred fifty-six thousand, six hundred seventy-seven".