181806646103 has 4 divisors (see below), whose sum is σ = 183606712008. Its totient is φ = 180006580200.

The previous prime is 181806645953. The next prime is 181806646123. The reversal of 181806646103 is 301646608181.

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 181806646103 - 2¹⁰ = 181806645079 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 (181806646123) 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 3 ways as a sum of consecutive naturals, for example, 900032801 + ... + 900033002.

It is an arithmetic number, because the mean of its divisors is an integer number (45901678002).

Almost surely, 2^181806646103 is an apocalyptic number.

181806646103 is a deficient number, since it is larger than the sum of its proper divisors (1800065905).

181806646103 is a wasteful number, since it uses less digits than its factorization.

181806646103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1800065904.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 181806646103 in words is "one hundred eighty-one billion, eight hundred six million, six hundred forty-six thousand, one hundred three".