81248031688796 has 24 divisors (see below), whose sum is σ = 162748778908800. Its totient is φ = 34766431681392.

The previous prime is 81248031688787. The next prime is 81248031688823. The reversal of 81248031688796 is 69788613084218.

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 7 ways as a sum of consecutive naturals, for example, 2256370346 + ... + 2256406353.

It is an arithmetic number, because the mean of its divisors is an integer number (6781199121200).

Almost surely, 2^{81248031688796} is an apocalyptic number.

It is an amenable number.

81248031688796 is an abundant number, since it is smaller than the sum of its proper divisors (81500747220004).

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

81248031688796 is a wasteful number, since it uses less digits than its factorization.

81248031688796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512777353 (or 4512777351 counting only the distinct ones).

The product of its (nonzero) digits is 222953472, while the sum is 71.

The spelling of 81248031688796 in words is "eighty-one trillion, two hundred forty-eight billion, thirty-one million, six hundred eighty-eight thousand, seven hundred ninety-six".