172873171573 has 4 divisors (see below), whose sum is σ = 180389396448. Its totient is φ = 165356946700.

The previous prime is 172873171571. The next prime is 172873171577. The reversal of 172873171573 is 375171378271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172873171573 - 2¹ = 172873171571 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172873171573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172873171571) 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, 3758112403 + ... + 3758112448.

It is an arithmetic number, because the mean of its divisors is an integer number (45097349112).

Almost surely, 2^172873171573 is an apocalyptic number.

It is an amenable number.

172873171573 is a deficient number, since it is larger than the sum of its proper divisors (7516224875).

172873171573 is an equidigital number, since it uses as much as digits as its factorization.

172873171573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7516224874.

The product of its digits is 1728720, while the sum is 52.

The spelling of 172873171573 in words is "one hundred seventy-two billion, eight hundred seventy-three million, one hundred seventy-one thousand, five hundred seventy-three".