12172324145 has 4 divisors (see below), whose sum is σ = 14606788980. Its totient is φ = 9737859312.

The previous prime is 12172324079. The next prime is 12172324159. The reversal of 12172324145 is 54142327121.

It is a happy number.

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 1371294961 + 10801029184 = 37031^2 + 103928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12172324145 is a prime.

It is a Curzon 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, 1217232410 + ... + 1217232419.

It is an arithmetic number, because the mean of its divisors is an integer number (3651697245).

Almost surely, 2^12172324145 is an apocalyptic number.

It is an amenable number.

12172324145 is a deficient number, since it is larger than the sum of its proper divisors (2434464835).

12172324145 is an equidigital number, since it uses as much as digits as its factorization.

12172324145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434464834.

The product of its digits is 13440, while the sum is 32.

The spelling of 12172324145 in words is "twelve billion, one hundred seventy-two million, three hundred twenty-four thousand, one hundred forty-five".