6664979 has 2 divisors, whose sum is σ = 6664980. Its totient is φ = 6664978.

The previous prime is 6664961. The next prime is 6664997. The reversal of 6664979 is 9794666.

Together with next prime (6664997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (6664961) and next prime (6664997).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6664979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6664939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332489 + 3332490.

It is an arithmetic number, because the mean of its divisors is an integer number (3332490).

Almost surely, 2^6664979 is an apocalyptic number.

6664979 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664979 is an equidigital number, since it uses as much as digits as its factorization.

6664979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 47.

The square root of 6664979 is about 2581.6620615410. The cubic root of 6664979 is about 188.1913228845.

The spelling of 6664979 in words is "six million, six hundred sixty-four thousand, nine hundred seventy-nine".