166945169 has 8 divisors (see below), whose sum is σ = 168266280. Its totient is φ = 165628800.

The previous prime is 166945139. The next prime is 166945171. The reversal of 166945169 is 961549661.

It is a happy number.

166945169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 18769 + 166926400 = 137^2 + 12920^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166945169 is a prime.

It is a super-2 number, since 2×166945169² = 55741378904877122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166945139) 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, 102179 + ... + 103799.

It is an arithmetic number, because the mean of its divisors is an integer number (21033285).

Almost surely, 2^166945169 is an apocalyptic number.

It is an amenable number.

166945169 is a deficient number, since it is larger than the sum of its proper divisors (1321111).

166945169 is a wasteful number, since it uses less digits than its factorization.

166945169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371.

The product of its digits is 349920, while the sum is 47.

The square root of 166945169 is about 12920.7263340727. The cubic root of 166945169 is about 550.6275690491.

The spelling of 166945169 in words is "one hundred sixty-six million, nine hundred forty-five thousand, one hundred sixty-nine".