6645225 has 24 divisors (see below), whose sum is σ = 11061792. Its totient is φ = 3520000.

The previous prime is 6645217. The next prime is 6645227. The reversal of 6645225 is 5225466.

It is not a de Polignac number, because 6645225 - 2³ = 6645217 is a prime.

It is a Curzon number.

6645225 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6645192 and 6645201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18649 + ... + 19001.

It is an arithmetic number, because the mean of its divisors is an integer number (460908).

Almost surely, 2^6645225 is an apocalyptic number.

It is an amenable number.

6645225 is a deficient number, since it is larger than the sum of its proper divisors (4416567).

6645225 is a wasteful number, since it uses less digits than its factorization.

6645225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 612 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

The square root of 6645225 is about 2577.8333925993. The cubic root of 6645225 is about 188.0052152620.

The spelling of 6645225 in words is "six million, six hundred forty-five thousand, two hundred twenty-five".