6543656 has 24 divisors (see below), whose sum is σ = 14273370. Its totient is φ = 2804256.

The previous prime is 6543643. The next prime is 6543659. The reversal of 6543656 is 6563456.

It can be written as a sum of positive squares in only one way, i.e., 6421156 + 122500 = 2534^2 + 350^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (6543659) 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 5 ways as a sum of consecutive naturals, for example, 7955 + ... + 8738.

Almost surely, 2^6543656 is an apocalyptic number.

It is an amenable number.

6543656 is an abundant number, since it is smaller than the sum of its proper divisors (7729714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6543656 is a wasteful number, since it uses less digits than its factorization.

6543656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16713 (or 16702 counting only the distinct ones).

The product of its digits is 64800, while the sum is 35.

The square root of 6543656 is about 2558.0570752038. The cubic root of 6543656 is about 187.0424374884.

The spelling of 6543656 in words is "six million, five hundred forty-three thousand, six hundred fifty-six".