12642192888581 has 2 divisors, whose sum is σ = 12642192888582. Its totient is φ = 12642192888580.

The previous prime is 12642192888571. The next prime is 12642192888617. The reversal of 12642192888581 is 18588829124621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12458542071556 + 183650817025 = 3529666^2 + 428545^2 .

It is a cyclic number.

It is not a de Polignac number, because 12642192888581 - 2⁶ = 12642192888517 is a prime.

It is a super-2 number, since 2×12642192888581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12642192888571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6321096444290 + 6321096444291.

It is an arithmetic number, because the mean of its divisors is an integer number (6321096444291).

Almost surely, 2^{12642192888581} is an apocalyptic number.

It is an amenable number.

12642192888581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12642192888581 is an equidigital number, since it uses as much as digits as its factorization.

12642192888581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35389440, while the sum is 65.

The spelling of 12642192888581 in words is "twelve trillion, six hundred forty-two billion, one hundred ninety-two million, eight hundred eighty-eight thousand, five hundred eighty-one".