165506011 has 8 divisors (see below), whose sum is σ = 184751424. Its totient is φ = 146960520.

The previous prime is 165505997. The next prime is 165506021. The reversal of 165506011 is 110605561.

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 165506011 - 2⁷ = 165505883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165506021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174481 + ... + 175426.

It is an arithmetic number, because the mean of its divisors is an integer number (23093928).

Almost surely, 2^165506011 is an apocalyptic number.

165506011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165506011 is a deficient number, since it is larger than the sum of its proper divisors (19245413).

165506011 is a wasteful number, since it uses less digits than its factorization.

165506011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349961.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 165506011 is about 12864.9139522968. The cubic root of 165506011 is about 549.0407643671.

The spelling of 165506011 in words is "one hundred sixty-five million, five hundred six thousand, eleven".