67777777777769 has 2 divisors, whose sum is σ = 67777777777770. Its totient is φ = 67777777777768.

The previous prime is 67777777777711. The next prime is 67777777777777. The reversal of 67777777777769 is 96777777777776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63277490731225 + 4500287046544 = 7954715^2 + 2121388^2 .

It is a cyclic number.

It is not a de Polignac number, because 67777777777769 - 2²⁴ = 67777761000553 is a prime.

It is a super-2 number, since 2×67777777777769² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67777777477769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33888888888884 + 33888888888885.

It is an arithmetic number, because the mean of its divisors is an integer number (33888888888885).

Almost surely, 2^{67777777777769} is an apocalyptic number.

It is an amenable number.

67777777777769 is a deficient number, since it is larger than the sum of its proper divisors (1).

67777777777769 is an equidigital number, since it uses as much as digits as its factorization.

67777777777769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640653864732, while the sum is 98.

The spelling of 67777777777769 in words is "sixty-seven trillion, seven hundred seventy-seven billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred sixty-nine".