6778602781 has 2 divisors, whose sum is σ = 6778602782. Its totient is φ = 6778602780.

The previous prime is 6778602769. The next prime is 6778602793. The reversal of 6778602781 is 1872068776.

6778602781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (6778602769) and next prime (6778602793).

It can be written as a sum of positive squares in only one way, i.e., 4587894756 + 2190708025 = 67734^2 + 46805^2 .

It is a cyclic number.

It is not a de Polignac number, because 6778602781 - 2⁵ = 6778602749 is a prime.

It is a super-2 number, since 2×6778602781² = 91898911325161867922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6778602751) 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, 3389301390 + 3389301391.

It is an arithmetic number, because the mean of its divisors is an integer number (3389301391).

Almost surely, 2^6778602781 is an apocalyptic number.

6778602781 is the 52072-nd centered pentagonal number.

It is an amenable number.

6778602781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778602781 is an equidigital number, since it uses as much as digits as its factorization.

6778602781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1580544, while the sum is 52.

The square root of 6778602781 is about 82332.2705930062. The cubic root of 6778602781 is about 1892.5472387951.

The spelling of 6778602781 in words is "six billion, seven hundred seventy-eight million, six hundred two thousand, seven hundred eighty-one".