12543221550199 has 4 divisors (see below), whose sum is σ = 12543252540840. Its totient is φ = 12543190559560.

The previous prime is 12543221550163. The next prime is 12543221550229. The reversal of 12543221550199 is 99105512234521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12543221550199 - 2⁷ = 12543221550071 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543221550109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14880064 + ... + 15700405.

It is an arithmetic number, because the mean of its divisors is an integer number (3135813135210).

Almost surely, 2^{12543221550199} is an apocalyptic number.

12543221550199 is a deficient number, since it is larger than the sum of its proper divisors (30990641).

12543221550199 is an equidigital number, since it uses as much as digits as its factorization.

12543221550199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30990640.

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 12543221550199 in words is "twelve trillion, five hundred forty-three billion, two hundred twenty-one million, five hundred fifty thousand, one hundred ninety-nine".