181116345809 has 32 divisors (see below), whose sum is σ = 216028377600. Its totient is φ = 148627353600.

The previous prime is 181116345749. The next prime is 181116345821. The reversal of 181116345809 is 908543611181.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181116345809 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (181116345899) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 4147529 + ... + 4190969.

It is an arithmetic number, because the mean of its divisors is an integer number (6750886800).

Almost surely, 2^181116345809 is an apocalyptic number.

It is an amenable number.

181116345809 is a deficient number, since it is larger than the sum of its proper divisors (34912031791).

181116345809 is a wasteful number, since it uses less digits than its factorization.

181116345809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43761.

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 181116345809 in words is "one hundred eighty-one billion, one hundred sixteen million, three hundred forty-five thousand, eight hundred nine".