168640171 has 4 divisors (see below), whose sum is σ = 192731632. Its totient is φ = 144548712.

The previous prime is 168640169. The next prime is 168640189. The reversal of 168640171 is 171046861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171046861 = 2939 ⋅58199.

It is not a de Polignac number, because 168640171 - 2¹ = 168640169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168640141) 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, 12045720 + ... + 12045733.

It is an arithmetic number, because the mean of its divisors is an integer number (48182908).

Almost surely, 2^168640171 is an apocalyptic number.

168640171 is a deficient number, since it is larger than the sum of its proper divisors (24091461).

168640171 is an equidigital number, since it uses as much as digits as its factorization.

168640171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24091460.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 168640171 is about 12986.1530485360. The cubic root of 168640171 is about 552.4848132978.

The spelling of 168640171 in words is "one hundred sixty-eight million, six hundred forty thousand, one hundred seventy-one".