165242666 has 16 divisors (see below), whose sum is σ = 257095080. Its totient is φ = 79588800.

The previous prime is 165242663. The next prime is 165242681. The reversal of 165242666 is 666242561.

It can be written as a sum of positive squares in 4 ways, for example, as 163968025 + 1274641 = 12805^2 + 1129^2 .

It is not an unprimeable number, because it can be changed into a prime (165242663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3581 + ... + 18528.

Almost surely, 2^165242666 is an apocalyptic number.

165242666 is a deficient number, since it is larger than the sum of its proper divisors (91852414).

165242666 is a wasteful number, since it uses less digits than its factorization.

165242666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22249.

The product of its digits is 103680, while the sum is 38.

The square root of 165242666 is about 12854.6748694784. The cubic root of 165242666 is about 548.7494075886.

The spelling of 165242666 in words is "one hundred sixty-five million, two hundred forty-two thousand, six hundred sixty-six".