12172645641 has 12 divisors (see below), whose sum is σ = 17574708048. Its totient is φ = 7490858544.

The previous prime is 12172645631. The next prime is 12172645657. The reversal of 12172645641 is 14654627121.

12172645641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12172645641 - 2¹⁷ = 12172514569 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12172645641.

It is not an unprimeable number, because it can be changed into a prime (12172645631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12004075 + ... + 12005088.

It is an arithmetic number, because the mean of its divisors is an integer number (1464559004).

Almost surely, 2^12172645641 is an apocalyptic number.

It is an amenable number.

12172645641 is a deficient number, since it is larger than the sum of its proper divisors (5402062407).

12172645641 is a wasteful number, since it uses less digits than its factorization.

12172645641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24009192 (or 24009179 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The spelling of 12172645641 in words is "twelve billion, one hundred seventy-two million, six hundred forty-five thousand, six hundred forty-one".