16645325 has 6 divisors (see below), whose sum is σ = 20640234. Its totient is φ = 13316240.

The previous prime is 16645319. The next prime is 16645331. The reversal of 16645325 is 52354661.

It is an interprime number because it is at equal distance from previous prime (16645319) and next prime (16645331).

It can be written as a sum of positive squares in 3 ways, for example, as 1999396 + 14645929 = 1414^2 + 3827^2 .

It is not a de Polignac number, because 16645325 - 2¹⁰ = 16644301 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16645291 and 16645300.

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, 332882 + ... + 332931.

It is an arithmetic number, because the mean of its divisors is an integer number (3440039).

Almost surely, 2^16645325 is an apocalyptic number.

It is an amenable number.

16645325 is a deficient number, since it is larger than the sum of its proper divisors (3994909).

16645325 is an equidigital number, since it uses as much as digits as its factorization.

16645325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665823 (or 665818 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 16645325 is about 4079.8682576770. The cubic root of 16645325 is about 255.3274020911.

Adding to 16645325 its reverse (52354661), we get a palindrome (68999986).

The spelling of 16645325 in words is "sixteen million, six hundred forty-five thousand, three hundred twenty-five".