166958065 has 16 divisors (see below), whose sum is σ = 202877136. Its totient is φ = 131891200.

The previous prime is 166958063. The next prime is 166958087. The reversal of 166958065 is 560859661.

It can be written as a sum of positive squares in 8 ways, for example, as 10608049 + 156350016 = 3257^2 + 12504^2 .

It is not a de Polignac number, because 166958065 - 2¹ = 166958063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166958063) 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 15 ways as a sum of consecutive naturals, for example, 260145 + ... + 260785.

It is an arithmetic number, because the mean of its divisors is an integer number (12679821).

Almost surely, 2^166958065 is an apocalyptic number.

It is an amenable number.

166958065 is a deficient number, since it is larger than the sum of its proper divisors (35919071).

166958065 is a wasteful number, since it uses less digits than its factorization.

166958065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 166958065 is about 12921.2253675880. The cubic root of 166958065 is about 550.6417467785.

The spelling of 166958065 in words is "one hundred sixty-six million, nine hundred fifty-eight thousand, sixty-five".