6664387 has 2 divisors, whose sum is σ = 6664388. Its totient is φ = 6664386.

The previous prime is 6664381. The next prime is 6664417. The reversal of 6664387 is 7834666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6664387 - 2¹⁵ = 6631619 is a prime.

It is a super-3 number, since 3×6664387³ (a number of 21 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (6664381) 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, 3332193 + 3332194.

It is an arithmetic number, because the mean of its divisors is an integer number (3332194).

Almost surely, 2^6664387 is an apocalyptic number.

6664387 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664387 is an equidigital number, since it uses as much as digits as its factorization.

6664387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 6664387 is about 2581.5474041745. The cubic root of 6664387 is about 188.1857508458.

The spelling of 6664387 in words is "six million, six hundred sixty-four thousand, three hundred eighty-seven".