6664866427 has 2 divisors, whose sum is σ = 6664866428. Its totient is φ = 6664866426.

The previous prime is 6664866419. The next prime is 6664866451. The reversal of 6664866427 is 7246684666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6664866427 - 2³ = 6664866419 is a prime.

It is not a weakly prime, because it can be changed into another prime (6664866487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332433213 + 3332433214.

It is an arithmetic number, because the mean of its divisors is an integer number (3332433214).

Almost surely, 2^6664866427 is an apocalyptic number.

6664866427 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664866427 is an equidigital number, since it uses as much as digits as its factorization.

6664866427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13934592, while the sum is 55.

The square root of 6664866427 is about 81638.6331769463. The cubic root of 6664866427 is about 1881.9026334722.

The spelling of 6664866427 in words is "six billion, six hundred sixty-four million, eight hundred sixty-six thousand, four hundred twenty-seven".