81600685115 has 8 divisors (see below), whose sum is σ = 101079558528. Its totient is φ = 63174723840.

The previous prime is 81600685109. The next prime is 81600685123. The reversal of 81600685115 is 51158600618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81600685115 - 2⁸ = 81600684859 is a prime.

It is a super-2 number, since 2×81600685115² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263227862 + ... + 263228171.

It is an arithmetic number, because the mean of its divisors is an integer number (12634944816).

Almost surely, 2^81600685115 is an apocalyptic number.

81600685115 is a deficient number, since it is larger than the sum of its proper divisors (19478873413).

81600685115 is a wasteful number, since it uses less digits than its factorization.

81600685115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526456069.

The product of its (nonzero) digits is 57600, while the sum is 41.

The spelling of 81600685115 in words is "eighty-one billion, six hundred million, six hundred eighty-five thousand, one hundred fifteen".