12145545523 has 4 divisors (see below), whose sum is σ = 12145903240. Its totient is φ = 12145187808.

The previous prime is 12145545509. The next prime is 12145545589. The reversal of 12145545523 is 32554554121.

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 12145545523 - 2⁹ = 12145545011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12145548523) 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 3 ways as a sum of consecutive naturals, for example, 121878 + ... + 197851.

It is an arithmetic number, because the mean of its divisors is an integer number (3036475810).

Almost surely, 2^12145545523 is an apocalyptic number.

12145545523 is a deficient number, since it is larger than the sum of its proper divisors (357717).

12145545523 is an equidigital number, since it uses as much as digits as its factorization.

12145545523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357716.

The product of its digits is 120000, while the sum is 37.

The spelling of 12145545523 in words is "twelve billion, one hundred forty-five million, five hundred forty-five thousand, five hundred twenty-three".