165165206 has 4 divisors (see below), whose sum is σ = 247747812. Its totient is φ = 82582602.

The previous prime is 165165197. The next prime is 165165227. The reversal of 165165206 is 602561561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 602561561 = 7 ⋅86080223.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41291300 + ... + 41291303.

It is an arithmetic number, because the mean of its divisors is an integer number (61936953).

Almost surely, 2^165165206 is an apocalyptic number.

165165206 is a deficient number, since it is larger than the sum of its proper divisors (82582606).

165165206 is an equidigital number, since it uses as much as digits as its factorization.

165165206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82582605.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 165165206 is about 12851.6616046331. The cubic root of 165165206 is about 548.6636493243.

The spelling of 165165206 in words is "one hundred sixty-five million, one hundred sixty-five thousand, two hundred six".