81911704582 has 16 divisors (see below), whose sum is σ = 123377418000. Its totient is φ = 40786030240.

The previous prime is 81911704579. The next prime is 81911704597. The reversal of 81911704582 is 28540711918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1265544 + ... + 1328692.

It is an arithmetic number, because the mean of its divisors is an integer number (7711088625).

Almost surely, 2^81911704582 is an apocalyptic number.

81911704582 is a deficient number, since it is larger than the sum of its proper divisors (41465713418).

81911704582 is a wasteful number, since it uses less digits than its factorization.

81911704582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65831.

The product of its (nonzero) digits is 161280, while the sum is 46.

The spelling of 81911704582 in words is "eighty-one billion, nine hundred eleven million, seven hundred four thousand, five hundred eighty-two".