165500266 has 4 divisors (see below), whose sum is σ = 248250402. Its totient is φ = 82750132.

The previous prime is 165500263. The next prime is 165500281. The reversal of 165500266 is 662005561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 662005561 = 7 ⋅94572223.

It can be written as a sum of positive squares in only one way, i.e., 117267241 + 48233025 = 10829^2 + 6945^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (165500261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41375065 + ... + 41375068.

Almost surely, 2^165500266 is an apocalyptic number.

165500266 is a deficient number, since it is larger than the sum of its proper divisors (82750136).

165500266 is an equidigital number, since it uses as much as digits as its factorization.

165500266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82750135.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 165500266 is about 12864.6906686480. The cubic root of 165500266 is about 549.0344115753.

The spelling of 165500266 in words is "one hundred sixty-five million, five hundred thousand, two hundred sixty-six".