15663225 has 12 divisors (see below), whose sum is σ = 25896656. Its totient is φ = 8353680.

The previous prime is 15663217. The next prime is 15663257. The reversal of 15663225 is 52236651.

15663225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15663225 - 2³ = 15663217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15663192 and 15663201.

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, 104347 + ... + 104496.

Almost surely, 2^15663225 is an apocalyptic number.

15663225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15663225 is a deficient number, since it is larger than the sum of its proper divisors (10233431).

15663225 is a wasteful number, since it uses less digits than its factorization.

15663225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208856 (or 208851 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 15663225 is about 3957.6792442036. The cubic root of 15663225 is about 250.2037006458.

Adding to 15663225 its reverse (52236651), we get a palindrome (67899876).

The spelling of 15663225 in words is "fifteen million, six hundred sixty-three thousand, two hundred twenty-five".