81472225331640 has 768 divisors, whose sum is σ = 305680143168000. Its totient is φ = 17171999170560.

The previous prime is 81472225331569. The next prime is 81472225331669. The reversal of 81472225331640 is 4613352227418.

It is a self number, because there is not a number n which added to its sum of digits gives 81472225331640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 733208406 + ... + 733319514.

It is an arithmetic number, because the mean of its divisors is an integer number (398021019750).

Almost surely, 2^{81472225331640} 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 81472225331640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152840071584000).

81472225331640 is an abundant number, since it is smaller than the sum of its proper divisors (224207917836360).

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

81472225331640 is a wasteful number, since it uses less digits than its factorization.

81472225331640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111352 (or 111335 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 48.

The spelling of 81472225331640 in words is "eighty-one trillion, four hundred seventy-two billion, two hundred twenty-five million, three hundred thirty-one thousand, six hundred forty".