166549 has 8 divisors (see below), whose sum is σ = 179928. Its totient is φ = 153600.

The previous prime is 166541. The next prime is 166561. The reversal of 166549 is 945661.

It can be written as a sum of positive squares in 4 ways, for example, as 87025 + 79524 = 295^2 + 282^2 .

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 166549 - 2³ = 166541 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 166549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166541) 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, 1599 + ... + 1699.

It is an arithmetic number, because the mean of its divisors is an integer number (22491).

2¹⁶⁶⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

166549 is a deficient number, since it is larger than the sum of its proper divisors (13379).

166549 is a wasteful number, since it uses less digits than its factorization.

166549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215.

The product of its digits is 6480, while the sum is 31.

The square root of 166549 is about 408.1041533726. The cubic root of 166549 is about 55.0191668735.

The spelling of 166549 in words is "one hundred sixty-six thousand, five hundred forty-nine".