6663396391 has 2 divisors, whose sum is σ = 6663396392. Its totient is φ = 6663396390.

The previous prime is 6663396373. The next prime is 6663396469. The reversal of 6663396391 is 1936933666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6663396391 - 2³¹ = 4515912743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6663396371) 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, 3331698195 + 3331698196.

It is an arithmetic number, because the mean of its divisors is an integer number (3331698196).

Almost surely, 2^6663396391 is an apocalyptic number.

6663396391 is a deficient number, since it is larger than the sum of its proper divisors (1).

6663396391 is an equidigital number, since it uses as much as digits as its factorization.

6663396391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2834352, while the sum is 52.

The square root of 6663396391 is about 81629.6293694881. The cubic root of 6663396391 is about 1881.7642627052.

The spelling of 6663396391 in words is "six billion, six hundred sixty-three million, three hundred ninety-six thousand, three hundred ninety-one".