166565005 has 8 divisors (see below), whose sum is σ = 201939192. Its totient is φ = 131877888.

The previous prime is 166564961. The next prime is 166565017. The reversal of 166565005 is 500565661.

It can be written as a sum of positive squares in 4 ways, for example, as 169 + 166564836 = 13^2 + 12906^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166565005 - 2¹³ = 166556813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171232 + ... + 172201.

It is an arithmetic number, because the mean of its divisors is an integer number (25242399).

Almost surely, 2^166565005 is an apocalyptic number.

It is an amenable number.

166565005 is a deficient number, since it is larger than the sum of its proper divisors (35374187).

166565005 is an equidigital number, since it uses as much as digits as its factorization.

166565005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343535.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 166565005 is about 12906.0065473407. The cubic root of 166565005 is about 550.2092922485.

The spelling of 166565005 in words is "one hundred sixty-six million, five hundred sixty-five thousand, five".