166945 has 8 divisors (see below), whose sum is σ = 202536. Its totient is φ = 132096.

The previous prime is 166931. The next prime is 166949. The reversal of 166945 is 549661.

It can be written as a sum of positive squares in 4 ways, for example, as 28561 + 138384 = 169^2 + 372^2 .

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 166945 - 2¹⁵ = 134177 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (166949) 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, 769 + ... + 961.

It is an arithmetic number, because the mean of its divisors is an integer number (25317).

2¹⁶⁶⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

166945 is a deficient number, since it is larger than the sum of its proper divisors (35591).

166945 is a wasteful number, since it uses less digits than its factorization.

166945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371.

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

The square root of 166945 is about 408.5890355847. The cubic root of 166945 is about 55.0627383247.

It can be divided in two parts, 166 and 945, that added together give a palindrome (1111).

The spelling of 166945 in words is "one hundred sixty-six thousand, nine hundred forty-five".