16646225 has 24 divisors (see below), whose sum is σ = 21808128. Its totient is φ = 12585600.

The previous prime is 16646207. The next prime is 16646237. The reversal of 16646225 is 52264661.

It is not a de Polignac number, because 16646225 - 2²⁰ = 15597649 is a prime.

Its product of digits (17280) is a multiple of the sum of its prime divisors (540).

It is a junction number, because it is equal to n+sod(n) for n = 16646191 and 16646200.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36197 + ... + 36653.

It is an arithmetic number, because the mean of its divisors is an integer number (908672).

Almost surely, 2^16646225 is an apocalyptic number.

It is an amenable number.

16646225 is a deficient number, since it is larger than the sum of its proper divisors (5161903).

16646225 is a wasteful number, since it uses less digits than its factorization.

16646225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 540 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 16646225 is about 4079.9785538652. The cubic root of 16646225 is about 255.3320037940.

The spelling of 16646225 in words is "sixteen million, six hundred forty-six thousand, two hundred twenty-five".