81682122632 has 64 divisors (see below), whose sum is σ = 171983044800. Its totient is φ = 36042589440.

The previous prime is 81682122623. The next prime is 81682122637. The reversal of 81682122632 is 23622128618.

It is a self number, because there is not a number n which added to its sum of digits gives 81682122632.

It is not an unprimeable number, because it can be changed into a prime (81682122637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1414094 + ... + 1470722.

It is an arithmetic number, because the mean of its divisors is an integer number (2687235075).

Almost surely, 2^81682122632 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 81682122632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85991522400).

81682122632 is an abundant number, since it is smaller than the sum of its proper divisors (90300922168).

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

81682122632 is a wasteful number, since it uses less digits than its factorization.

81682122632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57126 (or 57122 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The spelling of 81682122632 in words is "eighty-one billion, six hundred eighty-two million, one hundred twenty-two thousand, six hundred thirty-two".