81068247139789 has 24 divisors (see below), whose sum is σ = 101570841875328. Its totient is φ = 64133814255840.

The previous prime is 81068247139757. The next prime is 81068247139807. The reversal of 81068247139789 is 98793174286018.

It is not a de Polignac number, because 81068247139789 - 2⁵ = 81068247139757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81068247139489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2977857 + ... + 13076854.

It is an arithmetic number, because the mean of its divisors is an integer number (4232118411472).

Almost surely, 2^{81068247139789} is an apocalyptic number.

It is an amenable number.

81068247139789 is a deficient number, since it is larger than the sum of its proper divisors (20502594735539).

81068247139789 is a wasteful number, since it uses less digits than its factorization.

81068247139789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16062665 (or 16062658 counting only the distinct ones).

The product of its (nonzero) digits is 292626432, while the sum is 73.

The spelling of 81068247139789 in words is "eighty-one trillion, sixty-eight billion, two hundred forty-seven million, one hundred thirty-nine thousand, seven hundred eighty-nine".