6656403 has 24 divisors (see below), whose sum is σ = 10130880. Its totient is φ = 3875040.

The previous prime is 6656393. The next prime is 6656437. The reversal of 6656403 is 3046566.

It is not a de Polignac number, because 6656403 - 2⁴ = 6656387 is a prime.

6656403 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6656483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9288 + ... + 9978.

It is an arithmetic number, because the mean of its divisors is an integer number (422120).

Almost surely, 2^6656403 is an apocalyptic number.

6656403 is a deficient number, since it is larger than the sum of its proper divisors (3474477).

6656403 is a wasteful number, since it uses less digits than its factorization.

6656403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739 (or 726 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 6656403 is about 2580.0005813953. Note that the first 3 decimals coincide. The cubic root of 6656403 is about 188.1105713668.

The spelling of 6656403 in words is "six million, six hundred fifty-six thousand, four hundred three".