16640225 has 12 divisors (see below), whose sum is σ = 23581824. Its totient is φ = 11410320.

The previous prime is 16640207. The next prime is 16640227. The reversal of 16640225 is 52204661.

It is not a de Polignac number, because 16640225 - 2⁸ = 16639969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16640194 and 16640203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47369 + ... + 47718.

It is an arithmetic number, because the mean of its divisors is an integer number (1965152).

Almost surely, 2^16640225 is an apocalyptic number.

It is an amenable number.

16640225 is a deficient number, since it is larger than the sum of its proper divisors (6941599).

16640225 is an equidigital number, since it uses as much as digits as its factorization.

16640225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95104 (or 95099 counting only the distinct ones).

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

The square root of 16640225 is about 4079.2431896125. The cubic root of 16640225 is about 255.3013226411.

Adding to 16640225 its reverse (52204661), we get a palindrome (68844886).

The spelling of 16640225 in words is "sixteen million, six hundred forty thousand, two hundred twenty-five".