165221206 has 16 divisors (see below), whose sum is σ = 254943216. Its totient is φ = 80247456.

The previous prime is 165221197. The next prime is 165221209. The reversal of 165221206 is 602122561.

165221206 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165221209) 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, 56820 + ... + 59656.

It is an arithmetic number, because the mean of its divisors is an integer number (15933951).

Almost surely, 2^165221206 is an apocalyptic number.

165221206 is a deficient number, since it is larger than the sum of its proper divisors (89722010).

165221206 is a wasteful number, since it uses less digits than its factorization.

165221206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 165221206 is about 12853.8401265925. The cubic root of 165221206 is about 548.7256512703.

Adding to 165221206 its reverse (602122561), we get a palindrome (767343767).

The spelling of 165221206 in words is "one hundred sixty-five million, two hundred twenty-one thousand, two hundred six".