6777778249477 has 2 divisors, whose sum is σ = 6777778249478. Its totient is φ = 6777778249476.

The previous prime is 6777778249421. The next prime is 6777778249507. The reversal of 6777778249477 is 7749428777776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5482720593441 + 1295057656036 = 2341521^2 + 1138006^2 .

It is a cyclic number.

It is not a de Polignac number, because 6777778249477 - 2²⁷ = 6777644031749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6777778249477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6777778249877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3388889124738 + 3388889124739.

It is an arithmetic number, because the mean of its divisors is an integer number (3388889124739).

Almost surely, 2^{6777778249477} is an apocalyptic number.

It is an amenable number.

6777778249477 is a deficient number, since it is larger than the sum of its proper divisors (1).

6777778249477 is an equidigital number, since it uses as much as digits as its factorization.

6777778249477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11384658432, while the sum is 82.

The spelling of 6777778249477 in words is "six trillion, seven hundred seventy-seven billion, seven hundred seventy-eight million, two hundred forty-nine thousand, four hundred seventy-seven".