6645575 has 12 divisors (see below), whose sum is σ = 8282208. Its totient is φ = 5289600.

The previous prime is 6645571. The next prime is 6645577. The reversal of 6645575 is 5755466.

It is not a de Polignac number, because 6645575 - 2² = 6645571 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645571) 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 11 ways as a sum of consecutive naturals, for example, 5474 + ... + 6576.

It is an arithmetic number, because the mean of its divisors is an integer number (690184).

Almost surely, 2^6645575 is an apocalyptic number.

6645575 is a deficient number, since it is larger than the sum of its proper divisors (1636633).

6645575 is a wasteful number, since it uses less digits than its factorization.

6645575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354 (or 1349 counting only the distinct ones).

The product of its digits is 126000, while the sum is 38.

The square root of 6645575 is about 2577.9012781718. The cubic root of 6645575 is about 188.0085159112.

The spelling of 6645575 in words is "six million, six hundred forty-five thousand, five hundred seventy-five".