6656647 has 2 divisors, whose sum is σ = 6656648. Its totient is φ = 6656646.

The previous prime is 6656627. The next prime is 6656659. The reversal of 6656647 is 7466566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6656647 - 2¹⁵ = 6623879 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6656627) 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, 3328323 + 3328324.

It is an arithmetic number, because the mean of its divisors is an integer number (3328324).

Almost surely, 2^6656647 is an apocalyptic number.

6656647 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656647 is an equidigital number, since it uses as much as digits as its factorization.

6656647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 40.

The square root of 6656647 is about 2580.0478677730. The cubic root of 6656647 is about 188.1128698264.

The spelling of 6656647 in words is "six million, six hundred fifty-six thousand, six hundred forty-seven".