67777777777777 has 2 divisors, whose sum is σ = 67777777777778. Its totient is φ = 67777777777776.

The previous prime is 67777777777769. The next prime is 67777777777781. The reversal of 67777777777777 is 77777777777776.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64360570430016 + 3417207347761 = 8022504^2 + 1848569^2 .

It is a cyclic number.

It is not a de Polignac number, because 67777777777777 - 2³ = 67777777777769 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (67777777777277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33888888888888 + 33888888888889.

It is an arithmetic number, because the mean of its divisors is an integer number (33888888888889).

Almost surely, 2^{67777777777777} is an apocalyptic number.

It is an amenable number.

67777777777777 is a deficient number, since it is larger than the sum of its proper divisors (1).

67777777777777 is an equidigital number, since it uses as much as digits as its factorization.

67777777777777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 581334062442, while the sum is 97.

Subtracting 67777777777777 from its reverse (77777777777776), we obtain a palindrome (9999999999999).

The spelling of 67777777777777 in words is "sixty-seven trillion, seven hundred seventy-seven billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, seven hundred seventy-seven".