6777408709 has 2 divisors, whose sum is σ = 6777408710. Its totient is φ = 6777408708.

The previous prime is 6777408679. The next prime is 6777408749. The reversal of 6777408709 is 9078047776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6776911684 + 497025 = 82322^2 + 705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6777408709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6777408709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6777408749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3388704354 + 3388704355.

It is an arithmetic number, because the mean of its divisors is an integer number (3388704355).

Almost surely, 2^6777408709 is an apocalyptic number.

It is an amenable number.

6777408709 is a deficient number, since it is larger than the sum of its proper divisors (1).

6777408709 is an equidigital number, since it uses as much as digits as its factorization.

6777408709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4148928, while the sum is 55.

The square root of 6777408709 is about 82325.0187306386. The cubic root of 6777408709 is about 1892.4361062385.

The spelling of 6777408709 in words is "six billion, seven hundred seventy-seven million, four hundred eight thousand, seven hundred nine".