171198909909 has 24 divisors (see below), whose sum is σ = 258798860320. Its totient is φ = 113085500976.

The previous prime is 171198909881. The next prime is 171198909919. The reversal of 171198909909 is 909909891171.

It is not a de Polignac number, because 171198909909 - 2⁵ = 171198909877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171198909919) 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, 3205267 + ... + 3258240.

Almost surely, 2^171198909909 is an apocalyptic number.

It is an amenable number.

171198909909 is a deficient number, since it is larger than the sum of its proper divisors (87599950411).

171198909909 is an equidigital number, since it uses as much as digits as its factorization.

171198909909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6463631 (or 6463619 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 63.

The spelling of 171198909909 in words is "one hundred seventy-one billion, one hundred ninety-eight million, nine hundred nine thousand, nine hundred nine".