6786621971 has 2 divisors, whose sum is σ = 6786621972. Its totient is φ = 6786621970.

The previous prime is 6786621949. The next prime is 6786621973. The reversal of 6786621971 is 1791266876.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6786621971 - 2¹⁰ = 6786620947 is a prime.

Together with 6786621973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6786621973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3393310985 + 3393310986.

It is an arithmetic number, because the mean of its divisors is an integer number (3393310986).

Almost surely, 2^6786621971 is an apocalyptic number.

6786621971 is a deficient number, since it is larger than the sum of its proper divisors (1).

6786621971 is an equidigital number, since it uses as much as digits as its factorization.

6786621971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 53.

The square root of 6786621971 is about 82380.9563612853. The cubic root of 6786621971 is about 1893.2932487305.

The spelling of 6786621971 in words is "six billion, seven hundred eighty-six million, six hundred twenty-one thousand, nine hundred seventy-one".