6663971 has 2 divisors, whose sum is σ = 6663972. Its totient is φ = 6663970.

The previous prime is 6663961. The next prime is 6664019. The reversal of 6663971 is 1793666.

6663971 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 is a cyclic number.

It is not a de Polignac number, because 6663971 - 2⁶ = 6663907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6663901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3331985 + 3331986.

It is an arithmetic number, because the mean of its divisors is an integer number (3331986).

Almost surely, 2^6663971 is an apocalyptic number.

6663971 is a deficient number, since it is larger than the sum of its proper divisors (1).

6663971 is an equidigital number, since it uses as much as digits as its factorization.

6663971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The square root of 6663971 is about 2581.4668310865. The cubic root of 6663971 is about 188.1818351618.

The spelling of 6663971 in words is "six million, six hundred sixty-three thousand, nine hundred seventy-one".