6656539 has 2 divisors, whose sum is σ = 6656540. Its totient is φ = 6656538.

The previous prime is 6656527. The next prime is 6656543. The reversal of 6656539 is 9356566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6656539 is a prime.

It is a super-2 number, since 2×6656539² = 88619022917042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6656549) 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, 3328269 + 3328270.

It is an arithmetic number, because the mean of its divisors is an integer number (3328270).

Almost surely, 2^6656539 is an apocalyptic number.

6656539 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656539 is an equidigital number, since it uses as much as digits as its factorization.

6656539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 40.

The square root of 6656539 is about 2580.0269378439. The cubic root of 6656539 is about 188.1118524824. Note that the first 3 decimals are identical.

The spelling of 6656539 in words is "six million, six hundred fifty-six thousand, five hundred thirty-nine".