12144465565 has 4 divisors (see below), whose sum is σ = 14573358684. Its totient is φ = 9715572448.

The previous prime is 12144465511. The next prime is 12144465577. The reversal of 12144465565 is 56556444121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4181044921 + 7963420644 = 64661^2 + 89238^2 .

It is a cyclic number.

It is not a de Polignac number, because 12144465565 - 2²⁵ = 12110911133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1214446552 + ... + 1214446561.

It is an arithmetic number, because the mean of its divisors is an integer number (3643339671).

Almost surely, 2^12144465565 is an apocalyptic number.

It is an amenable number.

12144465565 is a deficient number, since it is larger than the sum of its proper divisors (2428893119).

12144465565 is an equidigital number, since it uses as much as digits as its factorization.

12144465565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2428893118.

The product of its digits is 576000, while the sum is 43.

The spelling of 12144465565 in words is "twelve billion, one hundred forty-four million, four hundred sixty-five thousand, five hundred sixty-five".