165206253 has 16 divisors (see below), whose sum is σ = 222405120. Its totient is φ = 109077936.

The previous prime is 165206219. The next prime is 165206257. The reversal of 165206253 is 352602561.

It is not a de Polignac number, because 165206253 - 2⁶ = 165206189 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165206253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165206257) 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, 209526 + ... + 210312.

It is an arithmetic number, because the mean of its divisors is an integer number (13900320).

Almost surely, 2^165206253 is an apocalyptic number.

It is an amenable number.

165206253 is a deficient number, since it is larger than the sum of its proper divisors (57198867).

165206253 is a wasteful number, since it uses less digits than its factorization.

165206253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 165206253 is about 12853.2584584610. The cubic root of 165206253 is about 548.7090970147.

The spelling of 165206253 in words is "one hundred sixty-five million, two hundred six thousand, two hundred fifty-three".