166442065 has 4 divisors (see below), whose sum is σ = 199730484. Its totient is φ = 133153648.

The previous prime is 166442051. The next prime is 166442113. The reversal of 166442065 is 560244661.

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 30393169 + 136048896 = 5513^2 + 11664^2 .

It is a cyclic number.

It is not a de Polignac number, because 166442065 - 2⁷ = 166441937 is a prime.

It is a super-2 number, since 2×166442065² = 55405922002928450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166442065.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16644202 + ... + 16644211.

It is an arithmetic number, because the mean of its divisors is an integer number (49932621).

Almost surely, 2^166442065 is an apocalyptic number.

It is an amenable number.

166442065 is a deficient number, since it is larger than the sum of its proper divisors (33288419).

166442065 is an equidigital number, since it uses as much as digits as its factorization.

166442065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33288418.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 166442065 is about 12901.2427695939. The cubic root of 166442065 is about 550.0738908990.

The spelling of 166442065 in words is "one hundred sixty-six million, four hundred forty-two thousand, sixty-five".