81802341816328 has 96 divisors (see below), whose sum is σ = 194022118382040. Its totient is φ = 32104121333760.

The previous prime is 81802341816287. The next prime is 81802341816341. The reversal of 81802341816328 is 82361814320818.

It can be written as a sum of positive squares in 4 ways, for example, as 81765323286724 + 37018529604 = 9042418^2 + 192402^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165635343 + ... + 166128478.

Almost surely, 2^{81802341816328} is an apocalyptic number.

It is an amenable number.

81802341816328 is an abundant number, since it is smaller than the sum of its proper divisors (112219776565712).

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

81802341816328 is a wasteful number, since it uses less digits than its factorization.

81802341816328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331763895 (or 331763884 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 55.

The spelling of 81802341816328 in words is "eighty-one trillion, eight hundred two billion, three hundred forty-one million, eight hundred sixteen thousand, three hundred twenty-eight".