165506201 has 16 divisors (see below), whose sum is σ = 191258496. Its totient is φ = 140292096.

The previous prime is 165506197. The next prime is 165506213. The reversal of 165506201 is 102605561.

It is not a de Polignac number, because 165506201 - 2² = 165506197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165506251) 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, 354170 + ... + 354636.

It is an arithmetic number, because the mean of its divisors is an integer number (11953656).

Almost surely, 2^165506201 is an apocalyptic number.

It is an amenable number.

165506201 is a deficient number, since it is larger than the sum of its proper divisors (25752295).

165506201 is a wasteful number, since it uses less digits than its factorization.

165506201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 165506201 is about 12864.9213367203. The cubic root of 165506201 is about 549.0409744657.

The spelling of 165506201 in words is "one hundred sixty-five million, five hundred six thousand, two hundred one".