12642661644281 has 2 divisors, whose sum is σ = 12642661644282. Its totient is φ = 12642661644280.

The previous prime is 12642661644269. The next prime is 12642661644293. The reversal of 12642661644281 is 18244616624621.

It is a balanced prime because it is at equal distance from previous prime (12642661644269) and next prime (12642661644293).

It can be written as a sum of positive squares in only one way, i.e., 12073602634681 + 569059009600 = 3474709^2 + 754360^2 .

It is a cyclic number.

It is not a de Polignac number, because 12642661644281 - 2⁴² = 8244615133177 is a prime.

It is a super-2 number, since 2×12642661644281² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12642661647281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321330822140 + 6321330822141.

It is an arithmetic number, because the mean of its divisors is an integer number (6321330822141).

Almost surely, 2^{12642661644281} is an apocalyptic number.

It is an amenable number.

12642661644281 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642661644281 is an equidigital number, since it uses as much as digits as its factorization.

12642661644281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5308416, while the sum is 53.

The spelling of 12642661644281 in words is "twelve trillion, six hundred forty-two billion, six hundred sixty-one million, six hundred forty-four thousand, two hundred eighty-one".