12543446165 has 8 divisors (see below), whose sum is σ = 15298892088. Its totient is φ = 9870252480.

The previous prime is 12543446161. The next prime is 12543446171. The reversal of 12543446165 is 56164434521.

It can be written as a sum of positive squares in 4 ways, for example, as 1217591236 + 11325854929 = 34894^2 + 106423^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12543446165 - 2² = 12543446161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12543446161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20562722 + ... + 20563331.

It is an arithmetic number, because the mean of its divisors is an integer number (1912361511).

Almost surely, 2^12543446165 is an apocalyptic number.

It is an amenable number.

12543446165 is a deficient number, since it is larger than the sum of its proper divisors (2755445923).

12543446165 is an equidigital number, since it uses as much as digits as its factorization.

12543446165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41126119.

The product of its digits is 345600, while the sum is 41.

The spelling of 12543446165 in words is "twelve billion, five hundred forty-three million, four hundred forty-six thousand, one hundred sixty-five".