81697583584 has 24 divisors (see below), whose sum is σ = 160849295208. Its totient is φ = 40846968960.

The previous prime is 81697583567. The next prime is 81697583641. The reversal of 81697583584 is 48538579618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939519 + ... + 1022785.

It is an arithmetic number, because the mean of its divisors is an integer number (6702053967).

Almost surely, 2^81697583584 is an apocalyptic number.

It is an amenable number.

81697583584 is a deficient number, since it is larger than the sum of its proper divisors (79151711624).

81697583584 is a wasteful number, since it uses less digits than its factorization.

81697583584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113938 (or 113930 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 64.

It can be divided in two parts, 81697 and 583584, that added together give a triangular number (665281 = T₁₁₅₃).

The spelling of 81697583584 in words is "eighty-one billion, six hundred ninety-seven million, five hundred eighty-three thousand, five hundred eighty-four".