165206945 has 8 divisors (see below), whose sum is σ = 199039680. Its totient is φ = 131638000.

The previous prime is 165206941. The next prime is 165206959. The reversal of 165206945 is 549602561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165206945 - 2² = 165206941 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 165206899 and 165206908.

It is not an unprimeable number, because it can be changed into a prime (165206941) 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, 64565 + ... + 67074.

It is an arithmetic number, because the mean of its divisors is an integer number (24879960).

Almost surely, 2^165206945 is an apocalyptic number.

It is an amenable number.

165206945 is a deficient number, since it is larger than the sum of its proper divisors (33832735).

165206945 is a wasteful number, since it uses less digits than its factorization.

165206945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131895.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 165206945 is about 12853.2853776768. The cubic root of 165206945 is about 548.7098631402.

The spelling of 165206945 in words is "one hundred sixty-five million, two hundred six thousand, nine hundred forty-five".