81596955744 has 240 divisors, whose sum is σ = 251035757280. Its totient is φ = 25951242240.

The previous prime is 81596955743. The next prime is 81596955757. The reversal of 81596955744 is 44755969518.

81596955744 is a `hidden beast` number, since 8 + 1 + 59 + 6 + 9 + 5 + 574 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81596955743) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 27481492 + ... + 27484460.

It is an arithmetic number, because the mean of its divisors is an integer number (1045982322).

Almost surely, 2^81596955744 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 81596955744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125517878640).

81596955744 is an abundant number, since it is smaller than the sum of its proper divisors (169438801536).

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

81596955744 is a wasteful number, since it uses less digits than its factorization.

81596955744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3475 (or 3458 counting only the distinct ones).

The product of its digits is 54432000, while the sum is 63.

The spelling of 81596955744 in words is "eighty-one billion, five hundred ninety-six million, nine hundred fifty-five thousand, seven hundred forty-four".