181673031641 has 2 divisors, whose sum is σ = 181673031642. Its totient is φ = 181673031640.

The previous prime is 181673031629. The next prime is 181673031643. The reversal of 181673031641 is 146130376181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110546275225 + 71126756416 = 332485^2 + 266696^2 .

It is a cyclic number.

It is not a de Polignac number, because 181673031641 - 2³⁰ = 180599289817 is a prime.

Together with 181673031643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (181673031643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90836515820 + 90836515821.

It is an arithmetic number, because the mean of its divisors is an integer number (90836515821).

Almost surely, 2^181673031641 is an apocalyptic number.

It is an amenable number.

181673031641 is a deficient number, since it is larger than the sum of its proper divisors (1).

181673031641 is an equidigital number, since it uses as much as digits as its factorization.

181673031641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 181673031641 in words is "one hundred eighty-one billion, six hundred seventy-three million, thirty-one thousand, six hundred forty-one".