81065489111 has 4 divisors (see below), whose sum is σ = 85834047312. Its totient is φ = 76296930912.

The previous prime is 81065489081. The next prime is 81065489147. The reversal of 81065489111 is 11198456018.

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 81065489111 - 2²² = 81061294807 is a prime.

It is a super-2 number, since 2×81065489111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81065489191) 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, 2384279075 + ... + 2384279108.

It is an arithmetic number, because the mean of its divisors is an integer number (21458511828).

Almost surely, 2^81065489111 is an apocalyptic number.

81065489111 is a deficient number, since it is larger than the sum of its proper divisors (4768558201).

81065489111 is a wasteful number, since it uses less digits than its factorization.

81065489111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4768558200.

The product of its (nonzero) digits is 69120, while the sum is 44.

The spelling of 81065489111 in words is "eighty-one billion, sixty-five million, four hundred eighty-nine thousand, one hundred eleven".