6656549 has 2 divisors, whose sum is σ = 6656550. Its totient is φ = 6656548.

The previous prime is 6656543. The next prime is 6656561. The reversal of 6656549 is 9456566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5094049 + 1562500 = 2257^2 + 1250^2 .

It is a cyclic number.

It is not a de Polignac number, because 6656549 - 2¹² = 6652453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6656543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328274 + 3328275.

It is an arithmetic number, because the mean of its divisors is an integer number (3328275).

Almost surely, 2^6656549 is an apocalyptic number.

It is an amenable number.

6656549 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656549 is an equidigital number, since it uses as much as digits as its factorization.

6656549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 41.

The square root of 6656549 is about 2580.0288758074. The cubic root of 6656549 is about 188.1119466813. Note that the first 3 decimals are identical.

The spelling of 6656549 in words is "six million, six hundred fifty-six thousand, five hundred forty-nine".