16604225 has 24 divisors (see below), whose sum is σ = 22692000. Its totient is φ = 12051600.

The previous prime is 16604201. The next prime is 16604227. The reversal of 16604225 is 52240661.

It is not a de Polignac number, because 16604225 - 2⁸ = 16603969 is a prime.

It is a super-3 number, since 3×16604225³ (a number of 23 digits) contains 333 as substring.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 16604194 and 16604203.

It is not an unprimeable number, because it can be changed into a prime (16604227) 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 in 23 ways as a sum of consecutive naturals, for example, 33026 + ... + 33524.

It is an arithmetic number, because the mean of its divisors is an integer number (945500).

Almost surely, 2^16604225 is an apocalyptic number.

It is an amenable number.

16604225 is a deficient number, since it is larger than the sum of its proper divisors (6087775).

16604225 is an equidigital number, since it uses as much as digits as its factorization.

16604225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 16604225 is about 4074.8282172381. The cubic root of 16604225 is about 255.1170806708.

Adding to 16604225 its reverse (52240661), we get a palindrome (68844886).

It can be divided in two parts, 1660 and 4225, that added together give a palindrome (5885).

The spelling of 16604225 in words is "sixteen million, six hundred four thousand, two hundred twenty-five".