12565144543111 has 4 divisors (see below), whose sum is σ = 12565152215352. Its totient is φ = 12565136870872.

The previous prime is 12565144543051. The next prime is 12565144543117. The reversal of 12565144543111 is 11134544156521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12565144543111 - 2⁷ = 12565144542983 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 (12565144543117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281716 + ... + 5020921.

It is an arithmetic number, because the mean of its divisors is an integer number (3141288053838).

Almost surely, 2^{12565144543111} is an apocalyptic number.

12565144543111 is a deficient number, since it is larger than the sum of its proper divisors (7672241).

12565144543111 is an equidigital number, since it uses as much as digits as its factorization.

12565144543111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7672240.

The product of its digits is 288000, while the sum is 43.

Adding to 12565144543111 its reverse (11134544156521), we get a palindrome (23699688699632).

The spelling of 12565144543111 in words is "twelve trillion, five hundred sixty-five billion, one hundred forty-four million, five hundred forty-three thousand, one hundred eleven".