81105133716 has 108 divisors (see below), whose sum is σ = 215166387072. Its totient is φ = 25732728000.

The previous prime is 81105133699. The next prime is 81105133727. The reversal of 81105133716 is 61733150118.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4142871 + ... + 4162401.

Almost surely, 2^81105133716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81105133716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107583193536).

81105133716 is an abundant number, since it is smaller than the sum of its proper divisors (134061253356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81105133716 is a wasteful number, since it uses less digits than its factorization.

81105133716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19694 (or 19628 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 81105133716 in words is "eighty-one billion, one hundred five million, one hundred thirty-three thousand, seven hundred sixteen".