6478606777 has 2 divisors, whose sum is σ = 6478606778. Its totient is φ = 6478606776.

The previous prime is 6478606769. The next prime is 6478606843. The reversal of 6478606777 is 7776068746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5227145401 + 1251461376 = 72299^2 + 35376^2 .

It is a cyclic number.

It is not a de Polignac number, because 6478606777 - 2³ = 6478606769 is a prime.

It is not a weakly prime, because it can be changed into another prime (6478606747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3239303388 + 3239303389.

It is an arithmetic number, because the mean of its divisors is an integer number (3239303389).

Almost surely, 2^6478606777 is an apocalyptic number.

It is an amenable number.

6478606777 is a deficient number, since it is larger than the sum of its proper divisors (1).

6478606777 is an equidigital number, since it uses as much as digits as its factorization.

6478606777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16595712, while the sum is 58.

The square root of 6478606777 is about 80489.7929988641. The cubic root of 6478606777 is about 1864.2058807919.

The spelling of 6478606777 in words is "six billion, four hundred seventy-eight million, six hundred six thousand, seven hundred seventy-seven".