171117517780209 has 128 divisors (see below), whose sum is σ = 309473685835776. Its totient is φ = 81214519680000.

The previous prime is 171117517780201. The next prime is 171117517780241. The reversal of 171117517780209 is 902087715711171.

It is not a de Polignac number, because 171117517780209 - 2³ = 171117517780201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171117517780201) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 913151647 + ... + 913339019.

It is an arithmetic number, because the mean of its divisors is an integer number (2417763170592).

Almost surely, 2^{171117517780209} is an apocalyptic number.

It is an amenable number.

171117517780209 is a deficient number, since it is larger than the sum of its proper divisors (138356168055567).

171117517780209 is a wasteful number, since it uses less digits than its factorization.

171117517780209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190519.

The product of its (nonzero) digits is 1728720, while the sum is 57.

The spelling of 171117517780209 in words is "one hundred seventy-one trillion, one hundred seventeen billion, five hundred seventeen million, seven hundred eighty thousand, two hundred nine".