6665947 has 2 divisors, whose sum is σ = 6665948. Its totient is φ = 6665946.

The previous prime is 6665927. The next prime is 6665951. The reversal of 6665947 is 7495666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6665947 - 2¹⁹ = 6141659 is a prime.

It is not a weakly prime, because it can be changed into another prime (6665917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332973 + 3332974.

It is an arithmetic number, because the mean of its divisors is an integer number (3332974).

Almost surely, 2^6665947 is an apocalyptic number.

6665947 is a deficient number, since it is larger than the sum of its proper divisors (1).

6665947 is an equidigital number, since it uses as much as digits as its factorization.

6665947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 6665947 is about 2581.8495308596. The cubic root of 6665947 is about 188.2004332099.

The spelling of 6665947 in words is "six million, six hundred sixty-five thousand, nine hundred forty-seven".