81389041679401 has 16 divisors (see below), whose sum is σ = 84008374344640. Its totient is φ = 78792787402560.

The previous prime is 81389041679389. The next prime is 81389041679417. The reversal of 81389041679401 is 10497614098318.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81389041679401 is a prime.

It is a super-2 number, since 2×81389041679401² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81389041679401.

It is not an unprimeable number, because it can be changed into a prime (81389041679471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 989391 + ... + 12796756.

It is an arithmetic number, because the mean of its divisors is an integer number (5250523396540).

Almost surely, 2^{81389041679401} is an apocalyptic number.

It is an amenable number.

81389041679401 is a deficient number, since it is larger than the sum of its proper divisors (2619332665239).

81389041679401 is a wasteful number, since it uses less digits than its factorization.

81389041679401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13786984.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 81389041679401 in words is "eighty-one trillion, three hundred eighty-nine billion, forty-one million, six hundred seventy-nine thousand, four hundred one".