12055781861 has 2 divisors, whose sum is σ = 12055781862. Its totient is φ = 12055781860.

The previous prime is 12055781851. The next prime is 12055781869. The reversal of 12055781861 is 16818755021.

12055781861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10912936225 + 1142845636 = 104465^2 + 33806^2 .

It is an emirp because it is prime and its reverse (16818755021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12055781861 - 2¹⁸ = 12055519717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12055781869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6027890930 + 6027890931.

It is an arithmetic number, because the mean of its divisors is an integer number (6027890931).

Almost surely, 2^12055781861 is an apocalyptic number.

It is an amenable number.

12055781861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12055781861 is an equidigital number, since it uses as much as digits as its factorization.

12055781861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134400, while the sum is 44.

The spelling of 12055781861 in words is "twelve billion, fifty-five million, seven hundred eighty-one thousand, eight hundred sixty-one".