67678817435729 has 2 divisors, whose sum is σ = 67678817435730. Its totient is φ = 67678817435728.

The previous prime is 67678817435587. The next prime is 67678817435771. The reversal of 67678817435729 is 92753471887676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66521314723600 + 1157502712129 = 8156060^2 + 1075873^2 .

It is a cyclic number.

It is not a de Polignac number, because 67678817435729 - 2¹² = 67678817431633 is a prime.

It is a super-2 number, since 2×67678817435729² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67678817425729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33839408717864 + 33839408717865.

It is an arithmetic number, because the mean of its divisors is an integer number (33839408717865).

Almost surely, 2^{67678817435729} is an apocalyptic number.

It is an amenable number.

67678817435729 is a deficient number, since it is larger than the sum of its proper divisors (1).

67678817435729 is an equidigital number, since it uses as much as digits as its factorization.

67678817435729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5974456320, while the sum is 80.

The spelling of 67678817435729 in words is "sixty-seven trillion, six hundred seventy-eight billion, eight hundred seventeen million, four hundred thirty-five thousand, seven hundred twenty-nine".