16445225 has 6 divisors (see below), whose sum is σ = 20392110. Its totient is φ = 13156160.

The previous prime is 16445183. The next prime is 16445227. The reversal of 16445225 is 52254461.

It can be written as a sum of positive squares in 3 ways, for example, as 316969 + 16128256 = 563^2 + 4016^2 .

It is not a de Polignac number, because 16445225 - 2¹⁰ = 16444201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16445227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 328880 + ... + 328929.

It is an arithmetic number, because the mean of its divisors is an integer number (3398685).

Almost surely, 2^16445225 is an apocalyptic number.

It is an amenable number.

16445225 is a deficient number, since it is larger than the sum of its proper divisors (3946885).

16445225 is an equidigital number, since it uses as much as digits as its factorization.

16445225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657819 (or 657814 counting only the distinct ones).

The product of its digits is 9600, while the sum is 29.

The square root of 16445225 is about 4055.2712609639. The cubic root of 16445225 is about 254.3001442897.

Adding to 16445225 its reverse (52254461), we get a palindrome (68699686).

The spelling of 16445225 in words is "sixteen million, four hundred forty-five thousand, two hundred twenty-five".