165206645 has 16 divisors (see below), whose sum is σ = 207187200. Its totient is φ = 126337344.

The previous prime is 165206623. The next prime is 165206647. The reversal of 165206645 is 546602561.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165206645 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165206647) 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, 1931 + ... + 18279.

It is an arithmetic number, because the mean of its divisors is an integer number (12949200).

Almost surely, 2^165206645 is an apocalyptic number.

It is an amenable number.

165206645 is a deficient number, since it is larger than the sum of its proper divisors (41980555).

165206645 is a wasteful number, since it uses less digits than its factorization.

165206645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16444.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 165206645 is about 12853.2737075035. The cubic root of 165206645 is about 548.7095310051.

The spelling of 165206645 in words is "one hundred sixty-five million, two hundred six thousand, six hundred forty-five".