181881168813 has 12 divisors (see below), whose sum is σ = 266417487648. Its totient is φ = 119546307720.

The previous prime is 181881168803. The next prime is 181881168817. The reversal of 181881168813 is 318861188181.

It is not a de Polignac number, because 181881168813 - 2³⁷ = 44442215341 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 181881168813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181881168817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142316395 + ... + 142317672.

It is an arithmetic number, because the mean of its divisors is an integer number (22201457304).

Almost surely, 2^181881168813 is an apocalyptic number.

It is an amenable number.

181881168813 is a deficient number, since it is larger than the sum of its proper divisors (84536318835).

181881168813 is a wasteful number, since it uses less digits than its factorization.

181881168813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284634144 (or 284634141 counting only the distinct ones).

The product of its digits is 589824, while the sum is 54.

The spelling of 181881168813 in words is "one hundred eighty-one billion, eight hundred eighty-one million, one hundred sixty-eight thousand, eight hundred thirteen".