12127789643 has 2 divisors, whose sum is σ = 12127789644. Its totient is φ = 12127789642.

The previous prime is 12127789633. The next prime is 12127789679. The reversal of 12127789643 is 34698772121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12127789643 - 2¹² = 12127785547 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 12127789591 and 12127789600.

It is not a weakly prime, because it can be changed into another prime (12127789633) 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, 6063894821 + 6063894822.

It is an arithmetic number, because the mean of its divisors is an integer number (6063894822).

Almost surely, 2^12127789643 is an apocalyptic number.

12127789643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12127789643 is an equidigital number, since it uses as much as digits as its factorization.

12127789643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The spelling of 12127789643 in words is "twelve billion, one hundred twenty-seven million, seven hundred eighty-nine thousand, six hundred forty-three".