181881168793 has 2 divisors, whose sum is σ = 181881168794. Its totient is φ = 181881168792.

The previous prime is 181881168757. The next prime is 181881168803. The reversal of 181881168793 is 397861188181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106166492224 + 75714676569 = 325832^2 + 275163^2 .

It is a cyclic number.

It is not a de Polignac number, because 181881168793 - 2¹⁷ = 181881037721 is a prime.

It is not a weakly prime, because it can be changed into another prime (181881168713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90940584396 + 90940584397.

It is an arithmetic number, because the mean of its divisors is an integer number (90940584397).

Almost surely, 2^181881168793 is an apocalyptic number.

It is an amenable number.

181881168793 is a deficient number, since it is larger than the sum of its proper divisors (1).

181881168793 is an equidigital number, since it uses as much as digits as its factorization.

181881168793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 61.

The spelling of 181881168793 in words is "one hundred eighty-one billion, eight hundred eighty-one million, one hundred sixty-eight thousand, seven hundred ninety-three".