81683808648 has 64 divisors (see below), whose sum is σ = 225861706560. Its totient is φ = 24454192896.

The previous prime is 81683808607. The next prime is 81683808673. The reversal of 81683808648 is 84680838618.

It is a junction number, because it is equal to n+sod(n) for n = 81683808591 and 81683808600.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3526390 + ... + 3549477.

It is an arithmetic number, because the mean of its divisors is an integer number (3529089165).

Almost surely, 2^81683808648 is an apocalyptic number.

It is an amenable number.

81683808648 is an abundant number, since it is smaller than the sum of its proper divisors (144177897912).

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

81683808648 is a wasteful number, since it uses less digits than its factorization.

81683808648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7075926 (or 7075922 counting only the distinct ones).

The product of its (nonzero) digits is 14155776, while the sum is 60.

The spelling of 81683808648 in words is "eighty-one billion, six hundred eighty-three million, eight hundred eight thousand, six hundred forty-eight".