6664771 has 2 divisors, whose sum is σ = 6664772. Its totient is φ = 6664770.

The previous prime is 6664769. The next prime is 6664787. The reversal of 6664771 is 1774666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6664771 - 2¹ = 6664769 is a prime.

Together with 6664769, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6664771.

It is not a weakly prime, because it can be changed into another prime (6664711) 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, 3332385 + 3332386.

It is an arithmetic number, because the mean of its divisors is an integer number (3332386).

Almost surely, 2^6664771 is an apocalyptic number.

6664771 is the 1491-st hex number.

6664771 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664771 is an equidigital number, since it uses as much as digits as its factorization.

6664771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 37.

The square root of 6664771 is about 2581.6217771006. The cubic root of 6664771 is about 188.1893651788.

The spelling of 6664771 in words is "six million, six hundred sixty-four thousand, seven hundred seventy-one".