81265812058111 has 4 divisors (see below), whose sum is σ = 81265855986000. Its totient is φ = 81265768130224.

The previous prime is 81265812058087. The next prime is 81265812058177. The reversal of 81265812058111 is 11185021856218.

It is a happy number.

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 81265812058111 - 2¹¹ = 81265812056063 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 (81265812058811) 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, 19061086 + ... + 22931563.

It is an arithmetic number, because the mean of its divisors is an integer number (20316463996500).

Almost surely, 2^{81265812058111} is an apocalyptic number.

81265812058111 is a deficient number, since it is larger than the sum of its proper divisors (43927889).

81265812058111 is a wasteful number, since it uses less digits than its factorization.

81265812058111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43927888.

The product of its (nonzero) digits is 307200, while the sum is 49.

The spelling of 81265812058111 in words is "eighty-one trillion, two hundred sixty-five billion, eight hundred twelve million, fifty-eight thousand, one hundred eleven".