12195445917 has 24 divisors (see below), whose sum is σ = 17128365408. Its totient is φ = 7717309600.

The previous prime is 12195445883. The next prime is 12195445921. The reversal of 12195445917 is 71954459121.

It is not a de Polignac number, because 12195445917 - 2¹⁶ = 12195380381 is a prime.

It is a super-2 number, since 2×12195445917² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12195445937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 178567 + ... + 237227.

It is an arithmetic number, because the mean of its divisors is an integer number (713681892).

Almost surely, 2^12195445917 is an apocalyptic number.

It is an amenable number.

12195445917 is a deficient number, since it is larger than the sum of its proper divisors (4932919491).

12195445917 is a wasteful number, since it uses less digits than its factorization.

12195445917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58841 (or 58818 counting only the distinct ones).

The product of its digits is 453600, while the sum is 48.

The spelling of 12195445917 in words is "twelve billion, one hundred ninety-five million, four hundred forty-five thousand, nine hundred seventeen".