81593108169 has 16 divisors (see below), whose sum is σ = 111529993344. Its totient is φ = 53027856000.

The previous prime is 81593108161. The next prime is 81593108231. The reversal of 81593108169 is 96180139518.

It is not a de Polignac number, because 81593108169 - 2³ = 81593108161 is a prime.

It is a super-2 number, since 2×81593108169² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81593108161) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 94282 + ... + 414819.

It is an arithmetic number, because the mean of its divisors is an integer number (6970624584).

Almost surely, 2^81593108169 is an apocalyptic number.

It is an amenable number.

81593108169 is a deficient number, since it is larger than the sum of its proper divisors (29936885175).

81593108169 is a wasteful number, since it uses less digits than its factorization.

81593108169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510448.

The product of its (nonzero) digits is 466560, while the sum is 51.

The spelling of 81593108169 in words is "eighty-one billion, five hundred ninety-three million, one hundred eight thousand, one hundred sixty-nine".