171665671 has 4 divisors (see below), whose sum is σ = 173332432. Its totient is φ = 169998912.

The previous prime is 171665621. The next prime is 171665687. The reversal of 171665671 is 176566171.

171665671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176566171 = 277 ⋅637423.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171665671 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 (171665621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833226 + ... + 833431.

It is an arithmetic number, because the mean of its divisors is an integer number (43333108).

Almost surely, 2^171665671 is an apocalyptic number.

171665671 is a deficient number, since it is larger than the sum of its proper divisors (1666761).

171665671 is a wasteful number, since it uses less digits than its factorization.

171665671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666760.

The product of its digits is 52920, while the sum is 40.

The square root of 171665671 is about 13102.1246750289. The cubic root of 171665671 is about 555.7692128708.

The spelling of 171665671 in words is "one hundred seventy-one million, six hundred sixty-five thousand, six hundred seventy-one".