67940618791 has 2 divisors, whose sum is σ = 67940618792. Its totient is φ = 67940618790.

The previous prime is 67940618719. The next prime is 67940618797. The reversal of 67940618791 is 19781604976.

Together with previous prime (67940618719) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67940618791 - 2¹³ = 67940610599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67940618797) 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, 33970309395 + 33970309396.

It is an arithmetic number, because the mean of its divisors is an integer number (33970309396).

Almost surely, 2^67940618791 is an apocalyptic number.

67940618791 is a deficient number, since it is larger than the sum of its proper divisors (1).

67940618791 is an equidigital number, since it uses as much as digits as its factorization.

67940618791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4572288, while the sum is 58.

The spelling of 67940618791 in words is "sixty-seven billion, nine hundred forty million, six hundred eighteen thousand, seven hundred ninety-one".