166647 has 8 divisors (see below), whose sum is σ = 239344. Its totient is φ = 102528.

The previous prime is 166643. The next prime is 166657. The reversal of 166647 is 746661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166647 - 2² = 166643 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2098 + ... + 2175.

It is an arithmetic number, because the mean of its divisors is an integer number (29918).

2¹⁶⁶⁶⁴⁷ is an apocalyptic number.

166647 is a deficient number, since it is larger than the sum of its proper divisors (72697).

166647 is a wasteful number, since it uses less digits than its factorization.

166647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4289.

The product of its digits is 6048, while the sum is 30.

The square root of 166647 is about 408.2242031041. The cubic root of 166647 is about 55.0299561330.

The spelling of 166647 in words is "one hundred sixty-six thousand, six hundred forty-seven".