16656925 has 6 divisors (see below), whose sum is σ = 20654618. Its totient is φ = 13325520.

The previous prime is 16656917. The next prime is 16656931. The reversal of 16656925 is 52965661.

It can be written as a sum of positive squares in 3 ways, for example, as 3617604 + 13039321 = 1902^2 + 3611^2 .

It is not a de Polignac number, because 16656925 - 2³ = 16656917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 333114 + ... + 333163.

Almost surely, 2^16656925 is an apocalyptic number.

It is an amenable number.

16656925 is a deficient number, since it is larger than the sum of its proper divisors (3997693).

16656925 is an equidigital number, since it uses as much as digits as its factorization.

16656925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666287 (or 666282 counting only the distinct ones).

The product of its digits is 97200, while the sum is 40.

The square root of 16656925 is about 4081.2896246162. The cubic root of 16656925 is about 255.3867002246.

The spelling of 16656925 in words is "sixteen million, six hundred fifty-six thousand, nine hundred twenty-five".