81080650500 has 96 divisors (see below), whose sum is σ = 244248600960. Its totient is φ = 20875926400.

The previous prime is 81080650487. The next prime is 81080650507. The reversal of 81080650500 is 505608018.

It is not an unprimeable number, because it can be changed into a prime (81080650507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 888462 + ... + 975461.

It is an arithmetic number, because the mean of its divisors is an integer number (2544256260).

Almost surely, 2^81080650500 is an apocalyptic number.

It is an amenable number.

81080650500 is an abundant number, since it is smaller than the sum of its proper divisors (163167950460).

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

81080650500 is a wasteful number, since it uses less digits than its factorization.

81080650500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863974 (or 1863962 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 33.

The spelling of 81080650500 in words is "eighty-one billion, eighty million, six hundred fifty thousand, five hundred".