67839742681 has 2 divisors, whose sum is σ = 67839742682. Its totient is φ = 67839742680.

The previous prime is 67839742577. The next prime is 67839742771. The reversal of 67839742681 is 18624793876.

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., 62829934281 + 5009808400 = 250659^2 + 70780^2 .

It is a cyclic number.

It is not a de Polignac number, because 67839742681 - 2⁹ = 67839742169 is a prime.

It is a super-2 number, since 2×67839742681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67839742981) 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, 33919871340 + 33919871341.

It is an arithmetic number, because the mean of its divisors is an integer number (33919871341).

Almost surely, 2^67839742681 is an apocalyptic number.

It is an amenable number.

67839742681 is a deficient number, since it is larger than the sum of its proper divisors (1).

67839742681 is an equidigital number, since it uses as much as digits as its factorization.

67839742681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24385536, while the sum is 61.

The spelling of 67839742681 in words is "sixty-seven billion, eight hundred thirty-nine million, seven hundred forty-two thousand, six hundred eighty-one".