6394916081 has 2 divisors, whose sum is σ = 6394916082. Its totient is φ = 6394916080.

The previous prime is 6394916039. The next prime is 6394916093. The reversal of 6394916081 is 1806194936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6152833600 + 242082481 = 78440^2 + 15559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6394916081 is a prime.

It is a super-2 number, since 2×6394916081² = 81789903366064797122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6394916981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3197458040 + 3197458041.

It is an arithmetic number, because the mean of its divisors is an integer number (3197458041).

Almost surely, 2^6394916081 is an apocalyptic number.

It is an amenable number.

6394916081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6394916081 is an equidigital number, since it uses as much as digits as its factorization.

6394916081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 6394916081 is about 79968.2191936272. The cubic root of 6394916081 is about 1856.1437894299.

The spelling of 6394916081 in words is "six billion, three hundred ninety-four million, nine hundred sixteen thousand, eighty-one".