16565138 has 4 divisors (see below), whose sum is σ = 24847710. Its totient is φ = 8282568.

The previous prime is 16565137. The next prime is 16565161. The reversal of 16565138 is 83156561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16540489 + 24649 = 4067^2 + 157^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16565098 and 16565107.

It is not an unprimeable number, because it can be changed into a prime (16565137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4141283 + ... + 4141286.

Almost surely, 2^16565138 is an apocalyptic number.

16565138 is a deficient number, since it is larger than the sum of its proper divisors (8282572).

16565138 is an equidigital number, since it uses as much as digits as its factorization.

16565138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8282571.

The product of its digits is 21600, while the sum is 35.

The square root of 16565138 is about 4070.0292382242. The cubic root of 16565138 is about 254.9167381632.

The spelling of 16565138 in words is "sixteen million, five hundred sixty-five thousand, one hundred thirty-eight".