81757343112 has 96 divisors (see below), whose sum is σ = 213420614400. Its totient is φ = 26068670208.

The previous prime is 81757343029. The next prime is 81757343117. The reversal of 81757343112 is 21134375718.

It is not an unprimeable number, because it can be changed into a prime (81757343117) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8264233 + ... + 8274119.

It is an arithmetic number, because the mean of its divisors is an integer number (2223131400).

Almost surely, 2^81757343112 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 81757343112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106710307200).

81757343112 is an abundant number, since it is smaller than the sum of its proper divisors (131663271288).

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

81757343112 is a wasteful number, since it uses less digits than its factorization.

81757343112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10143 (or 10030 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The spelling of 81757343112 in words is "eighty-one billion, seven hundred fifty-seven million, three hundred forty-three thousand, one hundred twelve".