6556636 has 6 divisors (see below), whose sum is σ = 11474120. Its totient is φ = 3278316.

The previous prime is 6556631. The next prime is 6556643. The reversal of 6556636 is 6366556.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6556595 and 6556604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6556631) 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 as a sum of consecutive naturals, namely, 819576 + ... + 819583.

Almost surely, 2^6556636 is an apocalyptic number.

It is an amenable number.

6556636 is a deficient number, since it is larger than the sum of its proper divisors (4917484).

6556636 is a wasteful number, since it uses less digits than its factorization.

6556636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639163 (or 1639161 counting only the distinct ones).

The product of its digits is 97200, while the sum is 37.

The square root of 6556636 is about 2560.5929000917. The cubic root of 6556636 is about 187.1660283035.

The spelling of 6556636 in words is "six million, five hundred fifty-six thousand, six hundred thirty-six".