81152056384 has 63 divisors (see below), whose sum is σ = 187364554023. Its totient is φ = 34772615808.

The previous prime is 81152056369. The next prime is 81152056439. The reversal of 81152056384 is 48365025118.

The square root of 81152056384 is 284872.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81152056384.

It is an unprimeable number.

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 8 ways as a sum of consecutive naturals, for example, 15950289 + ... + 15955375.

Almost surely, 2^81152056384 is an apocalyptic number.

81152056384 is the 284872-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81152056384

81152056384 is an abundant number, since it is smaller than the sum of its proper divisors (106212497639).

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

81152056384 is an frugal number, since it uses more digits than its factorization.

81152056384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10200 (or 5096 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 81152056384 in words is "eighty-one billion, one hundred fifty-two million, fifty-six thousand, three hundred eighty-four".