166545 has 12 divisors (see below), whose sum is σ = 288756. Its totient is φ = 88800.

The previous prime is 166541. The next prime is 166561. The reversal of 166545 is 545661.

It is a happy number.

166545 is a `hidden beast` number, since 1 + 6 + 654 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63504 + 103041 = 252^2 + 321^2 .

It is not a de Polignac number, because 166545 - 2² = 166541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166541) 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 11 ways as a sum of consecutive naturals, for example, 1806 + ... + 1895.

It is an arithmetic number, because the mean of its divisors is an integer number (24063).

2¹⁶⁶⁵⁴⁵ is an apocalyptic number.

166545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166545 is a deficient number, since it is larger than the sum of its proper divisors (122211).

166545 is a wasteful number, since it uses less digits than its factorization.

166545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3712 (or 3709 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 166545 is about 408.0992526335. The cubic root of 166545 is about 55.0187264057.

It can be divided in two parts, 16 and 6545, that added together give a 8-th power (6561 = 3⁸).

The spelling of 166545 in words is "one hundred sixty-six thousand, five hundred forty-five".