81413862712 has 128 divisors (see below), whose sum is σ = 189326592000. Its totient is φ = 31960355328.

The previous prime is 81413862697. The next prime is 81413862743. The reversal of 81413862712 is 21726831418.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105321558 + ... + 105322330.

It is an arithmetic number, because the mean of its divisors is an integer number (1479114000).

Almost surely, 2^81413862712 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 81413862712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94663296000).

81413862712 is an abundant number, since it is smaller than the sum of its proper divisors (107912729288).

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

81413862712 is a wasteful number, since it uses less digits than its factorization.

81413862712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 1721 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The spelling of 81413862712 in words is "eighty-one billion, four hundred thirteen million, eight hundred sixty-two thousand, seven hundred twelve".