67668136649 has 2 divisors, whose sum is σ = 67668136650. Its totient is φ = 67668136648.

The previous prime is 67668136639. The next prime is 67668136673. The reversal of 67668136649 is 94663186676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45334926400 + 22333210249 = 212920^2 + 149443^2 .

It is a cyclic number.

It is not a de Polignac number, because 67668136649 - 2⁴ = 67668136633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67668136591 and 67668136600.

It is not a weakly prime, because it can be changed into another prime (67668136639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33834068324 + 33834068325.

It is an arithmetic number, because the mean of its divisors is an integer number (33834068325).

Almost surely, 2^67668136649 is an apocalyptic number.

It is an amenable number.

67668136649 is a deficient number, since it is larger than the sum of its proper divisors (1).

67668136649 is an equidigital number, since it uses as much as digits as its factorization.

67668136649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47029248, while the sum is 62.

The spelling of 67668136649 in words is "sixty-seven billion, six hundred sixty-eight million, one hundred thirty-six thousand, six hundred forty-nine".