81843066758 has 16 divisors (see below), whose sum is σ = 123284899584. Its totient is φ = 40748361480.

The previous prime is 81843066727. The next prime is 81843066769. The reversal of 81843066758 is 85766034818.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 568391 + ... + 697677.

It is an arithmetic number, because the mean of its divisors is an integer number (7705306224).

Almost surely, 2^81843066758 is an apocalyptic number.

81843066758 is a deficient number, since it is larger than the sum of its proper divisors (41441832826).

81843066758 is a wasteful number, since it uses less digits than its factorization.

81843066758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130627.

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 81843066758 in words is "eighty-one billion, eight hundred forty-three million, sixty-six thousand, seven hundred fifty-eight".