6556657 has 2 divisors, whose sum is σ = 6556658. Its totient is φ = 6556656.

The previous prime is 6556651. The next prime is 6556673. The reversal of 6556657 is 7566556.

6556657 is nontrivially palindromic in base 3.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3594816 + 2961841 = 1896^2 + 1721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6556657 is a prime.

It is not a weakly prime, because it can be changed into another prime (6556651) 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, 3278328 + 3278329.

It is an arithmetic number, because the mean of its divisors is an integer number (3278329).

Almost surely, 2^6556657 is an apocalyptic number.

It is an amenable number.

6556657 is a deficient number, since it is larger than the sum of its proper divisors (1).

6556657 is an equidigital number, since it uses as much as digits as its factorization.

6556657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189000, while the sum is 40.

The square root of 6556657 is about 2560.5970007012. The cubic root of 6556657 is about 187.1662281256.

The spelling of 6556657 in words is "six million, five hundred fifty-six thousand, six hundred fifty-seven".