81073593515 has 4 divisors (see below), whose sum is σ = 97288312224. Its totient is φ = 64858874808.

The previous prime is 81073593439. The next prime is 81073593563. The reversal of 81073593515 is 51539537018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81073593515 - 2⁸ = 81073593259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81073593515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8107359347 + ... + 8107359356.

It is an arithmetic number, because the mean of its divisors is an integer number (24322078056).

Almost surely, 2^81073593515 is an apocalyptic number.

81073593515 is a deficient number, since it is larger than the sum of its proper divisors (16214718709).

81073593515 is a wasteful number, since it uses less digits than its factorization.

81073593515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16214718708.

The product of its (nonzero) digits is 567000, while the sum is 47.

The spelling of 81073593515 in words is "eighty-one billion, seventy-three million, five hundred ninety-three thousand, five hundred fifteen".