16505005 has 12 divisors (see below), whose sum is σ = 21771036. Its totient is φ = 12003200.

The previous prime is 16505003. The next prime is 16505009. The reversal of 16505005 is 50050561.

It can be written as a sum of positive squares in 2 ways, for example, as 9418761 + 7086244 = 3069^2 + 2662^2 .

It is not a de Polignac number, because 16505005 - 2¹ = 16505003 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 (16505003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13036 + ... + 14245.

It is an arithmetic number, because the mean of its divisors is an integer number (1814253).

Almost surely, 2^16505005 is an apocalyptic number.

It is an amenable number.

16505005 is a deficient number, since it is larger than the sum of its proper divisors (5266031).

16505005 is a wasteful number, since it uses less digits than its factorization.

16505005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27308 (or 27297 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 16505005 is about 4062.6352285186. The cubic root of 16505005 is about 254.6079069666.

Adding to 16505005 its reverse (50050561), we get a palindrome (66555566).

The spelling of 16505005 in words is "sixteen million, five hundred five thousand, five".