16725665 has 16 divisors (see below), whose sum is σ = 22489920. Its totient is φ = 11833920.

The previous prime is 16725661. The next prime is 16725689. The reversal of 16725665 is 56652761.

It is not a de Polignac number, because 16725665 - 2² = 16725661 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16725661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2075 + ... + 6144.

It is an arithmetic number, because the mean of its divisors is an integer number (1405620).

Almost surely, 2^16725665 is an apocalyptic number.

It is an amenable number.

16725665 is a deficient number, since it is larger than the sum of its proper divisors (5764255).

16725665 is a wasteful number, since it uses less digits than its factorization.

16725665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272.

The product of its digits is 75600, while the sum is 38.

The square root of 16725665 is about 4089.7023119049. The cubic root of 16725665 is about 255.7375290415.

It can be divided in two parts, 1672 and 5665, that added together give a palindrome (7337).

The spelling of 16725665 in words is "sixteen million, seven hundred twenty-five thousand, six hundred sixty-five".