6667388947 has 2 divisors, whose sum is σ = 6667388948. Its totient is φ = 6667388946.

The previous prime is 6667388941. The next prime is 6667388983. The reversal of 6667388947 is 7498837666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6667388947 is a prime.

It is not a weakly prime, because it can be changed into another prime (6667388941) 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, 3333694473 + 3333694474.

It is an arithmetic number, because the mean of its divisors is an integer number (3333694474).

Almost surely, 2^6667388947 is an apocalyptic number.

6667388947 is a deficient number, since it is larger than the sum of its proper divisors (1).

6667388947 is an equidigital number, since it uses as much as digits as its factorization.

6667388947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73156608, while the sum is 64.

The square root of 6667388947 is about 81654.0810186484. The cubic root of 6667388947 is about 1882.1400244892.

The spelling of 6667388947 in words is "six billion, six hundred sixty-seven million, three hundred eighty-eight thousand, nine hundred forty-seven".