81222530823448 has 16 divisors (see below), whose sum is σ = 174048280336080. Its totient is φ = 34809656067168.

The previous prime is 81222530823397. The next prime is 81222530823491. The reversal of 81222530823448 is 84432803522218.

It is a junction number, because it is equal to n+sod(n) for n = 81222530823395 and 81222530823404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 725201168011 + ... + 725201168122.

It is an arithmetic number, because the mean of its divisors is an integer number (10878017521005).

Almost surely, 2^{81222530823448} is an apocalyptic number.

It is an amenable number.

81222530823448 is an abundant number, since it is smaller than the sum of its proper divisors (92825749512632).

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

81222530823448 is a wasteful number, since it uses less digits than its factorization.

81222530823448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450402336146 (or 1450402336142 counting only the distinct ones).

The product of its (nonzero) digits is 5898240, while the sum is 52.

The spelling of 81222530823448 in words is "eighty-one trillion, two hundred twenty-two billion, five hundred thirty million, eight hundred twenty-three thousand, four hundred forty-eight".