165266 has 4 divisors (see below), whose sum is σ = 247902. Its totient is φ = 82632.

The previous prime is 165247. The next prime is 165287. The reversal of 165266 is 662561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 662561 = 23 ⋅28807.

It can be written as a sum of positive squares in only one way, i.e., 133225 + 32041 = 365^2 + 179^2 .

It is an unprimeable number.

165266 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41315 + ... + 41318.

2¹⁶⁵²⁶⁶ is an apocalyptic number.

165266 is a deficient number, since it is larger than the sum of its proper divisors (82636).

165266 is an equidigital number, since it uses as much as digits as its factorization.

165266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82635.

The product of its digits is 2160, while the sum is 26.

The square root of 165266 is about 406.5292117425. The cubic root of 165266 is about 54.8775236099.

The spelling of 165266 in words is "one hundred sixty-five thousand, two hundred sixty-six".