81683889359 has 6 divisors (see below), whose sum is σ = 83091831240. Its totient is φ = 80299413236.

The previous prime is 81683889293. The next prime is 81683889361. The reversal of 81683889359 is 95398838618.

It is not a de Polignac number, because 81683889359 - 2⁸ = 81683889103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81683889659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11729339 + ... + 11736300.

It is an arithmetic number, because the mean of its divisors is an integer number (13848638540).

Almost surely, 2^81683889359 is an apocalyptic number.

81683889359 is a deficient number, since it is larger than the sum of its proper divisors (1407941881).

81683889359 is an equidigital number, since it uses as much as digits as its factorization.

81683889359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23465757 (or 23465698 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 68.

The spelling of 81683889359 in words is "eighty-one billion, six hundred eighty-three million, eight hundred eighty-nine thousand, three hundred fifty-nine".