166481 has 8 divisors (see below), whose sum is σ = 201600. Its totient is φ = 134208.

The previous prime is 166471. The next prime is 166487. The reversal of 166481 is 184661.

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 166481 - 2⁶ = 166417 is a prime.

It is a super-2 number, since 2×166481² = 55431846722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166487) 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 7 ways as a sum of consecutive naturals, for example, 581 + ... + 818.

It is an arithmetic number, because the mean of its divisors is an integer number (25200).

2¹⁶⁶⁴⁸¹ is an apocalyptic number.

It is an amenable number.

166481 is a deficient number, since it is larger than the sum of its proper divisors (35119).

166481 is a wasteful number, since it uses less digits than its factorization.

166481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423.

The product of its digits is 1152, while the sum is 26.

The square root of 166481 is about 408.0208328015. The cubic root of 166481 is about 55.0116779611.

The spelling of 166481 in words is "one hundred sixty-six thousand, four hundred eighty-one".