81105268008199 has 16 divisors (see below), whose sum is σ = 87016967395200. Its totient is φ = 75363748271136.

The previous prime is 81105268008071. The next prime is 81105268008209. The reversal of 81105268008199 is 99180086250118.

It is a cyclic number.

It is not a de Polignac number, because 81105268008199 - 2⁷ = 81105268008071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81105268006199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81163464 + ... + 82156669.

It is an arithmetic number, because the mean of its divisors is an integer number (5438560462200).

Almost surely, 2^{81105268008199} is an apocalyptic number.

81105268008199 is a deficient number, since it is larger than the sum of its proper divisors (5911699387001).

81105268008199 is a wasteful number, since it uses less digits than its factorization.

81105268008199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163320654.

The product of its (nonzero) digits is 2488320, while the sum is 58.

The spelling of 81105268008199 in words is "eighty-one trillion, one hundred five billion, two hundred sixty-eight million, eight thousand, one hundred ninety-nine".