165212166 has 32 divisors (see below), whose sum is σ = 378074880. Its totient is φ = 47147616.

The previous prime is 165212161. The next prime is 165212207. The reversal of 165212166 is 661212561.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165212161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44805 + ... + 48351.

It is an arithmetic number, because the mean of its divisors is an integer number (11814840).

Almost surely, 2^165212166 is an apocalyptic number.

165212166 is an abundant number, since it is smaller than the sum of its proper divisors (212862714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165212166 is a wasteful number, since it uses less digits than its factorization.

165212166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4668.

The product of its digits is 4320, while the sum is 30.

The square root of 165212166 is about 12853.4884758963. The cubic root of 165212166 is about 548.7156433331.

The spelling of 165212166 in words is "one hundred sixty-five million, two hundred twelve thousand, one hundred sixty-six".