166020605 has 4 divisors (see below), whose sum is σ = 199224732. Its totient is φ = 132816480.

The previous prime is 166020599. The next prime is 166020607. The reversal of 166020605 is 506020661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506020661 = 20611 ⋅24551.

It can be written as a sum of positive squares in 2 ways, for example, as 77246521 + 88774084 = 8789^2 + 9422^2 .

It is a de Polignac number, because none of the positive numbers 2^k-166020605 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166020607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16602056 + ... + 16602065.

It is an arithmetic number, because the mean of its divisors is an integer number (49806183).

Almost surely, 2^166020605 is an apocalyptic number.

It is an amenable number.

166020605 is a deficient number, since it is larger than the sum of its proper divisors (33204127).

166020605 is an equidigital number, since it uses as much as digits as its factorization.

166020605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33204126.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 166020605 is about 12884.8983309920. The cubic root of 166020605 is about 549.6092044846.

The spelling of 166020605 in words is "one hundred sixty-six million, twenty thousand, six hundred five".