81342309708 has 144 divisors (see below), whose sum is σ = 227918396160. Its totient is φ = 24253257600.

The previous prime is 81342309673. The next prime is 81342309709. The reversal of 81342309708 is 80790324318.

It is not an unprimeable number, because it can be changed into a prime (81342309709) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40088838 + ... + 40090866.

It is an arithmetic number, because the mean of its divisors is an integer number (1582766640).

Almost surely, 2^81342309708 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 81342309708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113959198080).

81342309708 is an abundant number, since it is smaller than the sum of its proper divisors (146576086452).

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

81342309708 is a wasteful number, since it uses less digits than its factorization.

81342309708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628 (or 3623 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 81342309708 in words is "eighty-one billion, three hundred forty-two million, three hundred nine thousand, seven hundred eight".