166322665 has 4 divisors (see below), whose sum is σ = 199587204. Its totient is φ = 133058128.

The previous prime is 166322647. The next prime is 166322669. The reversal of 166322665 is 566223661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118657449 + 47665216 = 10893^2 + 6904^2 .

It is a cyclic number.

It is not a de Polignac number, because 166322665 - 2⁷ = 166322537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166322669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16632262 + ... + 16632271.

It is an arithmetic number, because the mean of its divisors is an integer number (49896801).

Almost surely, 2^166322665 is an apocalyptic number.

It is an amenable number.

166322665 is a deficient number, since it is larger than the sum of its proper divisors (33264539).

166322665 is an equidigital number, since it uses as much as digits as its factorization.

166322665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33264538.

The product of its digits is 77760, while the sum is 37.

The square root of 166322665 is about 12896.6144782264. The cubic root of 166322665 is about 549.9423245306.

The spelling of 166322665 in words is "one hundred sixty-six million, three hundred twenty-two thousand, six hundred sixty-five".