8016643291 has 2 divisors, whose sum is σ = 8016643292. Its totient is φ = 8016643290.

The previous prime is 8016643289. The next prime is 8016643351. The reversal of 8016643291 is 1923466108.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8016643291 - 2¹ = 8016643289 is a prime.

Together with 8016643289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8016643211) 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, 4008321645 + 4008321646.

It is an arithmetic number, because the mean of its divisors is an integer number (4008321646).

Almost surely, 2^8016643291 is an apocalyptic number.

8016643291 is a deficient number, since it is larger than the sum of its proper divisors (1).

8016643291 is an equidigital number, since it uses as much as digits as its factorization.

8016643291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 8016643291 is about 89535.7095856173. The cubic root of 8016643291 is about 2001.3859802242.

The spelling of 8016643291 in words is "eight billion, sixteen million, six hundred forty-three thousand, two hundred ninety-one".