6660679 has 2 divisors, whose sum is σ = 6660680. Its totient is φ = 6660678.

The previous prime is 6660677. The next prime is 6660707. The reversal of 6660679 is 9760666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6660679 - 2¹ = 6660677 is a prime.

Together with 6660677, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6660677) 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, 3330339 + 3330340.

It is an arithmetic number, because the mean of its divisors is an integer number (3330340).

Almost surely, 2^6660679 is an apocalyptic number.

6660679 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660679 is an equidigital number, since it uses as much as digits as its factorization.

6660679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 6660679 is about 2580.8291303378. The cubic root of 6660679 is about 188.1508427981.

The spelling of 6660679 in words is "six million, six hundred sixty thousand, six hundred seventy-nine".