12642367457 has 2 divisors, whose sum is σ = 12642367458. Its totient is φ = 12642367456.

The previous prime is 12642367411. The next prime is 12642367481. The reversal of 12642367457 is 75476324621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7697605696 + 4944761761 = 87736^2 + 70319^2 .

It is an emirp because it is prime and its reverse (75476324621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12642367457 - 2⁸ = 12642367201 is a prime.

It is not a weakly prime, because it can be changed into another prime (12642360457) 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, 6321183728 + 6321183729.

It is an arithmetic number, because the mean of its divisors is an integer number (6321183729).

Almost surely, 2^12642367457 is an apocalyptic number.

It is an amenable number.

12642367457 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642367457 is an equidigital number, since it uses as much as digits as its factorization.

12642367457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 47.

The spelling of 12642367457 in words is "twelve billion, six hundred forty-two million, three hundred sixty-seven thousand, four hundred fifty-seven".