172845568009 has 9 divisors (see below), whose sum is σ = 174988069543. Its totient is φ = 170729000032.

The previous prime is 172845568003. The next prime is 172845568013. The reversal of 172845568009 is 900865548271.

It is a happy number.

The square root of 172845568009 is 415747.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 81569073609 + 91276494400 = 285603^2 + 302120^2 .

It is not a de Polignac number, because 172845568009 - 2¹⁵ = 172845535241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172845568003) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 34504497 + ... + 34509505.

Almost surely, 2^172845568009 is an apocalyptic number.

172845568009 is the 415747-th square number.

172845568009 is the 207874-th centered octagonal number.

It is an amenable number.

172845568009 is a deficient number, since it is larger than the sum of its proper divisors (2142501534).

172845568009 is an frugal number, since it uses more digits than its factorization.

172845568009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10184 (or 5092 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 172845568009 in words is "one hundred seventy-two billion, eight hundred forty-five million, five hundred sixty-eight thousand, nine".