66871 has 8 divisors (see below), whose sum is σ = 78624. Its totient is φ = 55680.

The previous prime is 66863. The next prime is 66877. The reversal of 66871 is 17866.

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

It is a cyclic number.

It is not a de Polignac number, because 66871 - 2³ = 66863 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171 + ... + 403.

It is an arithmetic number, because the mean of its divisors is an integer number (9828).

2⁶⁶⁸⁷¹ is an apocalyptic number.

66871 is a deficient number, since it is larger than the sum of its proper divisors (11753).

66871 is a wasteful number, since it uses less digits than its factorization.

66871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281.

The product of its digits is 2016, while the sum is 28.

The square root of 66871 is about 258.5942768122. The cubic root of 66871 is about 40.5893976052.

The spelling of 66871 in words is "sixty-six thousand, eight hundred seventy-one".