16671 has 4 divisors (see below), whose sum is σ = 22232. Its totient is φ = 11112.

The previous prime is 16661. The next prime is 16673. The reversal of 16671 is 17661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16671 - 2⁶ = 16607 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776 + ... + 2781.

It is an arithmetic number, because the mean of its divisors is an integer number (5558).

2¹⁶⁶⁷¹ is an apocalyptic number.

16671 is a deficient number, since it is larger than the sum of its proper divisors (5561).

16671 is an equidigital number, since it uses as much as digits as its factorization.

16671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5560.

The product of its digits is 252, while the sum is 21.

The square root of 16671 is about 129.1162267107. The cubic root of 16671 is about 25.5458613374.

Subtracting 16671 from its reverse (17661), we obtain a triangular number (990 = T₄₄).

The spelling of 16671 in words is "sixteen thousand, six hundred seventy-one".