16608765625 has 21 divisors (see below), whose sum is σ = 20780847283. Its totient is φ = 13274125000.

The previous prime is 16608765617. The next prime is 16608765629. The reversal of 16608765625 is 52656780661.

The square root of 16608765625 is 128875.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 3 ways, for example, as 14550873129 + 2057892496 = 120627^2 + 45364^2 .

It is not a de Polignac number, because 16608765625 - 2³ = 16608765617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16608765629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 16108860 + ... + 16109890.

Almost surely, 2^16608765625 is an apocalyptic number.

16608765625 is the 128875-th square number.

16608765625 is the 64438-th centered octagonal number.

It is an amenable number.

16608765625 is a deficient number, since it is larger than the sum of its proper divisors (4172081658).

16608765625 is an frugal number, since it uses more digits than its factorization.

16608765625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2092 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 16608765625 in words is "sixteen billion, six hundred eight million, seven hundred sixty-five thousand, six hundred twenty-five".