171666243 has 16 divisors (see below), whose sum is σ = 290652160. Its totient is φ = 98094888.

The previous prime is 171666217. The next prime is 171666247. The reversal of 171666243 is 342666171.

It is a happy number.

It is not a de Polignac number, because 171666243 - 2¹² = 171662147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 171666198 and 171666207.

It is not an unprimeable number, because it can be changed into a prime (171666247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453955 + ... + 454332.

It is an arithmetic number, because the mean of its divisors is an integer number (18165760).

Almost surely, 2^171666243 is an apocalyptic number.

171666243 is a deficient number, since it is larger than the sum of its proper divisors (118985917).

171666243 is an equidigital number, since it uses as much as digits as its factorization.

171666243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908303 (or 908297 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 171666243 is about 13102.1465035314. The cubic root of 171666243 is about 555.7698301553.

It can be divided in two parts, 17166 and 6243, that added together give a square (23409 = 153²).

The spelling of 171666243 in words is "one hundred seventy-one million, six hundred sixty-six thousand, two hundred forty-three".