6856764091 has 2 divisors, whose sum is σ = 6856764092. Its totient is φ = 6856764090.

The previous prime is 6856764067. The next prime is 6856764143. The reversal of 6856764091 is 1904676586.

It is an a-pointer prime, because the next prime (6856764143) can be obtained adding 6856764091 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6856764091 - 2⁹ = 6856763579 is a prime.

It is not a weakly prime, because it can be changed into another prime (6856764041) 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, 3428382045 + 3428382046.

It is an arithmetic number, because the mean of its divisors is an integer number (3428382046).

Almost surely, 2^6856764091 is an apocalyptic number.

6856764091 is a deficient number, since it is larger than the sum of its proper divisors (1).

6856764091 is an equidigital number, since it uses as much as digits as its factorization.

6856764091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 6856764091 is about 82805.5800716353. The cubic root of 6856764091 is about 1899.7935224377.

The spelling of 6856764091 in words is "six billion, eight hundred fifty-six million, seven hundred sixty-four thousand, ninety-one".