166163065 has 4 divisors (see below), whose sum is σ = 199395684. Its totient is φ = 132930448.

The previous prime is 166163047. The next prime is 166163071. The reversal of 166163065 is 560361661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560361661 = 19 ⋅29492719.

It can be written as a sum of positive squares in 2 ways, for example, as 40297104 + 125865961 = 6348^2 + 11219^2 .

It is a cyclic number.

It is not a de Polignac number, because 166163065 - 2¹⁷ = 166031993 is a prime.

It is a super-2 number, since 2×166163065² = 55220328340388450, 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 166163065.

It is an unprimeable number.

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, 16616302 + ... + 16616311.

It is an arithmetic number, because the mean of its divisors is an integer number (49848921).

Almost surely, 2^166163065 is an apocalyptic number.

It is an amenable number.

166163065 is a deficient number, since it is larger than the sum of its proper divisors (33232619).

166163065 is an equidigital number, since it uses as much as digits as its factorization.

166163065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33232618.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 166163065 is about 12890.4253226959. The cubic root of 166163065 is about 549.7663635767.

The spelling of 166163065 in words is "one hundred sixty-six million, one hundred sixty-three thousand, sixty-five".