81395081382 has 8 divisors (see below), whose sum is σ = 162790162776. Its totient is φ = 27131693792.

The previous prime is 81395081353. The next prime is 81395081401. The reversal of 81395081382 is 28318059318.

It is a sphenic number, since it is the product of 3 distinct primes.

81395081382 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6782923443 + ... + 6782923454.

It is an arithmetic number, because the mean of its divisors is an integer number (20348770347).

Almost surely, 2^81395081382 is an apocalyptic number.

81395081382 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81395081382 is a wasteful number, since it uses less digits than its factorization.

81395081382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13565846902.

The product of its (nonzero) digits is 414720, while the sum is 48.

The spelling of 81395081382 in words is "eighty-one billion, three hundred ninety-five million, eighty-one thousand, three hundred eighty-two".