81032315536 has 20 divisors (see below), whose sum is σ = 157026433792. Its totient is φ = 40509364896.

The previous prime is 81032315521. The next prime is 81032315563. The reversal of 81032315536 is 63551323018.

It is a super-2 number, since 2×81032315536² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81032315495 and 81032315504.

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 3 ways as a sum of consecutive naturals, for example, 325440 + ... + 517663.

Almost surely, 2^81032315536 is an apocalyptic number.

It is an amenable number.

81032315536 is a deficient number, since it is larger than the sum of its proper divisors (75994118256).

81032315536 is a wasteful number, since it uses less digits than its factorization.

81032315536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849118 (or 849112 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 81032315536 in words is "eighty-one billion, thirty-two million, three hundred fifteen thousand, five hundred thirty-six".