81846159157320 has 96 divisors (see below), whose sum is σ = 247945494398400. Its totient is φ = 21613742664576.

The previous prime is 81846159157319. The next prime is 81846159157331. The reversal of 81846159157320 is 2375195164818.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30871860 + ... + 33418019.

It is an arithmetic number, because the mean of its divisors is an integer number (2582765566650).

It is a 1-persistent number, because it is pandigital, but 2⋅81846159157320 = 163692318314640 is not.

Almost surely, 2^{81846159157320} is an apocalyptic number.

It is an amenable number.

81846159157320 is an abundant number, since it is smaller than the sum of its proper divisors (166099335241080).

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

81846159157320 is a wasteful number, since it uses less digits than its factorization.

81846159157320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64290099 (or 64289992 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 60.

The spelling of 81846159157320 in words is "eighty-one trillion, eight hundred forty-six billion, one hundred fifty-nine million, one hundred fifty-seven thousand, three hundred twenty".