6678509 has 2 divisors, whose sum is σ = 6678510. Its totient is φ = 6678508.

The previous prime is 6678499. The next prime is 6678521. The reversal of 6678509 is 9058766.

It is a happy number.

6678509 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4502884 + 2175625 = 2122^2 + 1475^2 .

It is a cyclic number.

It is not a de Polignac number, because 6678509 - 2¹² = 6674413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6678109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3339254 + 3339255.

It is an arithmetic number, because the mean of its divisors is an integer number (3339255).

Almost surely, 2^6678509 is an apocalyptic number.

It is an amenable number.

6678509 is a deficient number, since it is larger than the sum of its proper divisors (1).

6678509 is an equidigital number, since it uses as much as digits as its factorization.

6678509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 6678509 is about 2584.2811379569. The cubic root of 6678509 is about 188.3185804787.

The spelling of 6678509 in words is "six million, six hundred seventy-eight thousand, five hundred nine".