16505465 has 4 divisors (see below), whose sum is σ = 19806564. Its totient is φ = 13204368.

The previous prime is 16505459. The next prime is 16505477. The reversal of 16505465 is 56450561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56450561 = 229 ⋅246509.

It can be written as a sum of positive squares in 2 ways, for example, as 7166329 + 9339136 = 2677^2 + 3056^2 .

It is a cyclic number.

It is not a de Polignac number, because 16505465 - 2⁴ = 16505449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650542 + ... + 1650551.

It is an arithmetic number, because the mean of its divisors is an integer number (4951641).

Almost surely, 2^16505465 is an apocalyptic number.

It is an amenable number.

16505465 is a deficient number, since it is larger than the sum of its proper divisors (3301099).

16505465 is an equidigital number, since it uses as much as digits as its factorization.

16505465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301098.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 16505465 is about 4062.6918416242. The cubic root of 16505465 is about 254.6102722804.

The spelling of 16505465 in words is "sixteen million, five hundred five thousand, four hundred sixty-five".