81683061244 has 12 divisors (see below), whose sum is σ = 144667590984. Its totient is φ = 40349463824.

The previous prime is 81683061241. The next prime is 81683061259. The reversal of 81683061244 is 44216038618.

It is a self number, because there is not a number n which added to its sum of digits gives 81683061244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81683061241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123016327 + ... + 123016990.

It is an arithmetic number, because the mean of its divisors is an integer number (12055632582).

Almost surely, 2^81683061244 is an apocalyptic number.

It is an amenable number.

81683061244 is a deficient number, since it is larger than the sum of its proper divisors (62984529740).

81683061244 is a wasteful number, since it uses less digits than its factorization.

81683061244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246033404 (or 246033402 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 81683061244 in words is "eighty-one billion, six hundred eighty-three million, sixty-one thousand, two hundred forty-four".