181746669473 has 2 divisors, whose sum is σ = 181746669474. Its totient is φ = 181746669472.

The previous prime is 181746669431. The next prime is 181746669491. The reversal of 181746669473 is 374966647181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162588787729 + 19157881744 = 403223^2 + 138412^2 .

It is a cyclic number.

It is not a de Polignac number, because 181746669473 - 2⁶ = 181746669409 is a prime.

It is not a weakly prime, because it can be changed into another prime (181746669493) 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 as a sum of consecutive naturals, namely, 90873334736 + 90873334737.

It is an arithmetic number, because the mean of its divisors is an integer number (90873334737).

Almost surely, 2^181746669473 is an apocalyptic number.

It is an amenable number.

181746669473 is a deficient number, since it is larger than the sum of its proper divisors (1).

181746669473 is an equidigital number, since it uses as much as digits as its factorization.

181746669473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36578304, while the sum is 62.

The spelling of 181746669473 in words is "one hundred eighty-one billion, seven hundred forty-six million, six hundred sixty-nine thousand, four hundred seventy-three".