12184871357861 has 2 divisors, whose sum is σ = 12184871357862. Its totient is φ = 12184871357860.

The previous prime is 12184871357839. The next prime is 12184871357947. The reversal of 12184871357861 is 16875317848121.

12184871357861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8214041980225 + 3970829377636 = 2866015^2 + 1992694^2 .

It is a cyclic number.

It is not a de Polignac number, because 12184871357861 - 2¹⁸ = 12184871095717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12184871357794 and 12184871357803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12184871357831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6092435678930 + 6092435678931.

It is an arithmetic number, because the mean of its divisors is an integer number (6092435678931).

Almost surely, 2^{12184871357861} is an apocalyptic number.

It is an amenable number.

12184871357861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12184871357861 is an equidigital number, since it uses as much as digits as its factorization.

12184871357861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18063360, while the sum is 62.

The spelling of 12184871357861 in words is "twelve trillion, one hundred eighty-four billion, eight hundred seventy-one million, three hundred fifty-seven thousand, eight hundred sixty-one".