6777777857 has 2 divisors, whose sum is σ = 6777777858. Its totient is φ = 6777777856.

The previous prime is 6777777791. The next prime is 6777777913. The reversal of 6777777857 is 7587777776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6729905296 + 47872561 = 82036^2 + 6919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6777777857 is a prime.

It is not a weakly prime, because it can be changed into another prime (6777777157) 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, 3388888928 + 3388888929.

It is an arithmetic number, because the mean of its divisors is an integer number (3388888929).

Almost surely, 2^6777777857 is an apocalyptic number.

It is an amenable number.

6777777857 is a deficient number, since it is larger than the sum of its proper divisors (1).

6777777857 is an equidigital number, since it uses as much as digits as its factorization.

6777777857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 197650320, while the sum is 68.

The square root of 6777777857 is about 82327.2607159986. The cubic root of 6777777857 is about 1892.4704643219.

The spelling of 6777777857 in words is "six billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, eight hundred fifty-seven".