6778557867733 has 2 divisors, whose sum is σ = 6778557867734. Its totient is φ = 6778557867732.

The previous prime is 6778557867623. The next prime is 6778557867749. The reversal of 6778557867733 is 3377687558776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5975594917009 + 802962950724 = 2444503^2 + 896082^2 .

It is a cyclic number.

It is not a de Polignac number, because 6778557867733 - 2²⁹ = 6778020996821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6778557897733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3389278933866 + 3389278933867.

It is an arithmetic number, because the mean of its divisors is an integer number (3389278933867).

Almost surely, 2^{6778557867733} is an apocalyptic number.

It is an amenable number.

6778557867733 is a deficient number, since it is larger than the sum of its proper divisors (1).

6778557867733 is an equidigital number, since it uses as much as digits as its factorization.

6778557867733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8712748800, while the sum is 79.

The spelling of 6778557867733 in words is "six trillion, seven hundred seventy-eight billion, five hundred fifty-seven million, eight hundred sixty-seven thousand, seven hundred thirty-three".