16565225 has 12 divisors (see below), whose sum is σ = 21749724. Its totient is φ = 12472320.

The previous prime is 16565209. The next prime is 16565249. The reversal of 16565225 is 52256561.

It can be written as a sum of positive squares in 6 ways, for example, as 1104601 + 15460624 = 1051^2 + 3932^2 .

It is not a de Polignac number, because 16565225 - 2⁴ = 16565209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16565191 and 16565200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19064 + ... + 19913.

It is an arithmetic number, because the mean of its divisors is an integer number (1812477).

Almost surely, 2^16565225 is an apocalyptic number.

It is an amenable number.

16565225 is a deficient number, since it is larger than the sum of its proper divisors (5184499).

16565225 is a wasteful number, since it uses less digits than its factorization.

16565225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39004 (or 38999 counting only the distinct ones).

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

The square root of 16565225 is about 4070.0399260941. The cubic root of 16565225 is about 254.9171844361.

The spelling of 16565225 in words is "sixteen million, five hundred sixty-five thousand, two hundred twenty-five".