67843640781639 has 24 divisors (see below), whose sum is σ = 101677011304960. Its totient is φ = 45206331029496.

The previous prime is 67843640781601. The next prime is 67843640781649. The reversal of 67843640781639 is 93618704634876.

67843640781639 is a `hidden beast` number, since 6 + 7 + 84 + 3 + 6 + 407 + 81 + 63 + 9 = 666.

It is not a de Polignac number, because 67843640781639 - 2⁸ = 67843640781383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67843640781649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69771799 + ... + 70737480.

Almost surely, 2^{67843640781639} is an apocalyptic number.

67843640781639 is a deficient number, since it is larger than the sum of its proper divisors (33833370523321).

67843640781639 is a wasteful number, since it uses less digits than its factorization.

67843640781639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140511281 (or 140511269 counting only the distinct ones).

The product of its (nonzero) digits is 877879296, while the sum is 72.

The spelling of 67843640781639 in words is "sixty-seven trillion, eight hundred forty-three billion, six hundred forty million, seven hundred eighty-one thousand, six hundred thirty-nine".