16508005 has 4 divisors (see below), whose sum is σ = 19809612. Its totient is φ = 13206400.

The previous prime is 16507999. The next prime is 16508029. The reversal of 16508005 is 50080561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50080561 = 19 ⋅2635819.

It can be written as a sum of positive squares in 2 ways, for example, as 5919489 + 10588516 = 2433^2 + 3254^2 .

It is not a de Polignac number, because 16508005 - 2¹⁵ = 16475237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650796 + ... + 1650805.

It is an arithmetic number, because the mean of its divisors is an integer number (4952403).

Almost surely, 2^16508005 is an apocalyptic number.

It is an amenable number.

16508005 is a deficient number, since it is larger than the sum of its proper divisors (3301607).

16508005 is an equidigital number, since it uses as much as digits as its factorization.

16508005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301606.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 16508005 is about 4063.0044302216. The cubic root of 16508005 is about 254.6233321351.

Adding to 16508005 its reverse (50080561), we get a palindrome (66588566).

The spelling of 16508005 in words is "sixteen million, five hundred eight thousand, five".