81206113116311 has 4 divisors (see below), whose sum is σ = 81315999603000. Its totient is φ = 81096226629624.

The previous prime is 81206113116257. The next prime is 81206113116313. The reversal of 81206113116311 is 11361131160218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81206113116311 - 2²⁶ = 81206046007447 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 (81206113116313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54943242236 + ... + 54943243713.

It is an arithmetic number, because the mean of its divisors is an integer number (20328999900750).

Almost surely, 2^{81206113116311} is an apocalyptic number.

81206113116311 is a deficient number, since it is larger than the sum of its proper divisors (109886486689).

81206113116311 is a wasteful number, since it uses less digits than its factorization.

81206113116311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109886486688.

The product of its (nonzero) digits is 5184, while the sum is 35.

Adding to 81206113116311 its reverse (11361131160218), we get a palindrome (92567244276529).

The spelling of 81206113116311 in words is "eighty-one trillion, two hundred six billion, one hundred thirteen million, one hundred sixteen thousand, three hundred eleven".