165503009 has 8 divisors (see below), whose sum is σ = 197370240. Its totient is φ = 135691776.

The previous prime is 165503003. The next prime is 165503021. The reversal of 165503009 is 900305561.

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

It is a cyclic number.

It is not a de Polignac number, because 165503009 - 2⁴ = 165502993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165503003) 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, 513824 + ... + 514145.

It is an arithmetic number, because the mean of its divisors is an integer number (24671280).

Almost surely, 2^165503009 is an apocalyptic number.

It is an amenable number.

165503009 is a deficient number, since it is larger than the sum of its proper divisors (31867231).

165503009 is a wasteful number, since it uses less digits than its factorization.

165503009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027999.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 165503009 is about 12864.7972778431. The cubic root of 165503009 is about 549.0374447891.

The spelling of 165503009 in words is "one hundred sixty-five million, five hundred three thousand, nine".