16656225 has 24 divisors (see below), whose sum is σ = 27661920. Its totient is φ = 8843520.

The previous prime is 16656223. The next prime is 16656239. The reversal of 16656225 is 52265661.

It is a happy number.

It is not a de Polignac number, because 16656225 - 2¹ = 16656223 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16656223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24946 + ... + 25604.

It is an arithmetic number, because the mean of its divisors is an integer number (1152580).

Almost surely, 2^16656225 is an apocalyptic number.

16656225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16656225 is a deficient number, since it is larger than the sum of its proper divisors (11005695).

16656225 is a wasteful number, since it uses less digits than its factorization.

16656225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009 (or 1004 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 16656225 is about 4081.2038665080. The cubic root of 16656225 is about 255.3831226697.

The spelling of 16656225 in words is "sixteen million, six hundred fifty-six thousand, two hundred twenty-five".