6656543 has 2 divisors, whose sum is σ = 6656544. Its totient is φ = 6656542.

The previous prime is 6656539. The next prime is 6656549. The reversal of 6656543 is 3456566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6656543 - 2² = 6656539 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6656549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328271 + 3328272.

It is an arithmetic number, because the mean of its divisors is an integer number (3328272).

Almost surely, 2^6656543 is an apocalyptic number.

6656543 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656543 is an equidigital number, since it uses as much as digits as its factorization.

6656543 is an evil number, because the sum of its binary digits is even.

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

The square root of 6656543 is about 2580.0277130295. The cubic root of 6656543 is about 188.1118901620. Note that the first 3 decimals are identical.

The spelling of 6656543 in words is "six million, six hundred fifty-six thousand, five hundred forty-three".