81680502085182 has 192 divisors, whose sum is σ = 240065660749824. Its totient is φ = 19381842155520.

The previous prime is 81680502085177. The next prime is 81680502085213. The reversal of 81680502085182 is 28158020508618.

81680502085182 is a `hidden beast` number, since 8 + 1 + 6 + 8 + 0 + 502 + 0 + 8 + 51 + 82 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21619638 + ... + 25115129.

It is an arithmetic number, because the mean of its divisors is an integer number (1250341983072).

Almost surely, 2^{81680502085182} is an apocalyptic number.

81680502085182 is an abundant number, since it is smaller than the sum of its proper divisors (158385158664642).

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

81680502085182 is a wasteful number, since it uses less digits than its factorization.

81680502085182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46734903 (or 46734900 counting only the distinct ones).

The product of its (nonzero) digits is 2457600, while the sum is 54.

The spelling of 81680502085182 in words is "eighty-one trillion, six hundred eighty billion, five hundred two million, eighty-five thousand, one hundred eighty-two".