12188447549 has 2 divisors, whose sum is σ = 12188447550. Its totient is φ = 12188447548.

The previous prime is 12188447539. The next prime is 12188447581. The reversal of 12188447549 is 94574488121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10071527449 + 2116920100 = 100357^2 + 46010^2 .

It is a cyclic number.

It is not a de Polignac number, because 12188447549 - 2¹² = 12188443453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12188447549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12188447539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6094223774 + 6094223775.

It is an arithmetic number, because the mean of its divisors is an integer number (6094223775).

Almost surely, 2^12188447549 is an apocalyptic number.

It is an amenable number.

12188447549 is a deficient number, since it is larger than the sum of its proper divisors (1).

12188447549 is an equidigital number, since it uses as much as digits as its factorization.

12188447549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2580480, while the sum is 53.

The spelling of 12188447549 in words is "twelve billion, one hundred eighty-eight million, four hundred forty-seven thousand, five hundred forty-nine".