81593584388 has 24 divisors (see below), whose sum is σ = 143891563200. Its totient is φ = 40482810720.

The previous prime is 81593584367. The next prime is 81593584393. The reversal of 81593584388 is 88348539518.

It is a self number, because there is not a number n which added to its sum of digits gives 81593584388.

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, 159503 + ... + 434313.

It is an arithmetic number, because the mean of its divisors is an integer number (5995481800).

Almost surely, 2^81593584388 is an apocalyptic number.

It is an amenable number.

81593584388 is a deficient number, since it is larger than the sum of its proper divisors (62297978812).

81593584388 is a wasteful number, since it uses less digits than its factorization.

81593584388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275387 (or 275385 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 62.

The spelling of 81593584388 in words is "eighty-one billion, five hundred ninety-three million, five hundred eighty-four thousand, three hundred eighty-eight".