6664663679 has 2 divisors, whose sum is σ = 6664663680. Its totient is φ = 6664663678.

The previous prime is 6664663661. The next prime is 6664663703. The reversal of 6664663679 is 9763664666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6664663679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6664663639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332331839 + 3332331840.

It is an arithmetic number, because the mean of its divisors is an integer number (3332331840).

Almost surely, 2^6664663679 is an apocalyptic number.

6664663679 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664663679 is an equidigital number, since it uses as much as digits as its factorization.

6664663679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35271936, while the sum is 59.

The square root of 6664663679 is about 81637.3914269681. The cubic root of 6664663679 is about 1881.8835505259.

The spelling of 6664663679 in words is "six billion, six hundred sixty-four million, six hundred sixty-three thousand, six hundred seventy-nine".