173212730305 has 4 divisors (see below), whose sum is σ = 207855276372. Its totient is φ = 138570184240.

The previous prime is 173212730303. The next prime is 173212730311. The reversal of 173212730305 is 503037212371.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503037212371 = 97 ⋅5185950643.

It can be written as a sum of positive squares in 2 ways, for example, as 113709909681 + 59502820624 = 337209^2 + 243932^2 .

It is not a de Polignac number, because 173212730305 - 2¹ = 173212730303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (173212730303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17321273026 + ... + 17321273035.

It is an arithmetic number, because the mean of its divisors is an integer number (51963819093).

Almost surely, 2^173212730305 is an apocalyptic number.

It is an amenable number.

173212730305 is a deficient number, since it is larger than the sum of its proper divisors (34642546067).

173212730305 is an equidigital number, since it uses as much as digits as its factorization.

173212730305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34642546066.

The product of its (nonzero) digits is 26460, while the sum is 34.

Adding to 173212730305 its reverse (503037212371), we get a palindrome (676249942676).

The spelling of 173212730305 in words is "one hundred seventy-three billion, two hundred twelve million, seven hundred thirty thousand, three hundred five".