12180493543861 has 2 divisors, whose sum is σ = 12180493543862. Its totient is φ = 12180493543860.

The previous prime is 12180493543793. The next prime is 12180493543871. The reversal of 12180493543861 is 16834539408121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6375675500100 + 5804818043761 = 2525010^2 + 2409319^2 .

It is a cyclic number.

It is not a de Polignac number, because 12180493543861 - 2¹³ = 12180493535669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12180493543871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6090246771930 + 6090246771931.

It is an arithmetic number, because the mean of its divisors is an integer number (6090246771931).

Almost surely, 2^{12180493543861} is an apocalyptic number.

It is an amenable number.

12180493543861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12180493543861 is an equidigital number, since it uses as much as digits as its factorization.

12180493543861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 12180493543861 in words is "twelve trillion, one hundred eighty billion, four hundred ninety-three million, five hundred forty-three thousand, eight hundred sixty-one".