16505165 has 8 divisors (see below), whose sum is σ = 20289528. Its totient is φ = 12881920.

The previous prime is 16505161. The next prime is 16505171. The reversal of 16505165 is 56150561.

It can be written as a sum of positive squares in 4 ways, for example, as 1590121 + 14915044 = 1261^2 + 3862^2 .

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

It is not a de Polignac number, because 16505165 - 2² = 16505161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505161) 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, 40052 + ... + 40461.

It is an arithmetic number, because the mean of its divisors is an integer number (2536191).

Almost surely, 2^16505165 is an apocalyptic number.

It is an amenable number.

16505165 is a deficient number, since it is larger than the sum of its proper divisors (3784363).

16505165 is an equidigital number, since it uses as much as digits as its factorization.

16505165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80559.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 16505165 is about 4062.6549201230. The cubic root of 16505165 is about 254.6087296895.

The spelling of 16505165 in words is "sixteen million, five hundred five thousand, one hundred sixty-five".