6778045443817 has 2 divisors, whose sum is σ = 6778045443818. Its totient is φ = 6778045443816.

The previous prime is 6778045443797. The next prime is 6778045443887. The reversal of 6778045443817 is 7183445408776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6673314892176 + 104730551641 = 2583276^2 + 323621^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6778045443817 is a prime.

It is not a weakly prime, because it can be changed into another prime (6778045443887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389022721908 + 3389022721909.

It is an arithmetic number, because the mean of its divisors is an integer number (3389022721909).

Almost surely, 2^{6778045443817} is an apocalyptic number.

It is an amenable number.

6778045443817 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778045443817 is an equidigital number, since it uses as much as digits as its factorization.

6778045443817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126443520, while the sum is 64.

The spelling of 6778045443817 in words is "six trillion, seven hundred seventy-eight billion, forty-five million, four hundred forty-three thousand, eight hundred seventeen".