68881442578079 has 2 divisors, whose sum is σ = 68881442578080. Its totient is φ = 68881442578078.

The previous prime is 68881442578037. The next prime is 68881442578163. The reversal of 68881442578079 is 97087524418886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68881442578079 - 2⁸ = 68881442577823 is a prime.

It is a super-4 number, since 4×68881442578079⁴ (a number of 56 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68881442578019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34440721289039 + 34440721289040.

It is an arithmetic number, because the mean of its divisors is an integer number (34440721289040).

Almost surely, 2^{68881442578079} is an apocalyptic number.

68881442578079 is a deficient number, since it is larger than the sum of its proper divisors (1).

68881442578079 is an equidigital number, since it uses as much as digits as its factorization.

68881442578079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1734082560, while the sum is 77.

The spelling of 68881442578079 in words is "sixty-eight trillion, eight hundred eighty-one billion, four hundred forty-two million, five hundred seventy-eight thousand, seventy-nine".