12543703336861 has 2 divisors, whose sum is σ = 12543703336862. Its totient is φ = 12543703336860.

The previous prime is 12543703336847. The next prime is 12543703336889. The reversal of 12543703336861 is 16863330734521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11970949528836 + 572753808025 = 3459906^2 + 756805^2 .

It is a cyclic number.

It is not a de Polignac number, because 12543703336861 - 2⁹ = 12543703336349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12543703336799 and 12543703336808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12543703336831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6271851668430 + 6271851668431.

It is an arithmetic number, because the mean of its divisors is an integer number (6271851668431).

Almost surely, 2^{12543703336861} is an apocalyptic number.

It is an amenable number.

12543703336861 is a deficient number, since it is larger than the sum of its proper divisors (1).

12543703336861 is an equidigital number, since it uses as much as digits as its factorization.

12543703336861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 52.

The spelling of 12543703336861 in words is "twelve trillion, five hundred forty-three billion, seven hundred three million, three hundred thirty-six thousand, eight hundred sixty-one".