217172217005 has 8 divisors (see below), whose sum is σ = 263746500192. Its totient is φ = 171644547088.

The previous prime is 217172216953. The next prime is 217172217007. The reversal of 217172217005 is 500712271712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 217172217005 - 2¹² = 217172212909 is a prime.

It is a super-2 number, since 2×217172217005² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217172217007) 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 in 7 ways as a sum of consecutive naturals, for example, 261652859 + ... + 261653688.

It is an arithmetic number, because the mean of its divisors is an integer number (32968312524).

Almost surely, 2^217172217005 is an apocalyptic number.

It is an amenable number.

217172217005 is a deficient number, since it is larger than the sum of its proper divisors (46574283187).

217172217005 is an equidigital number, since it uses as much as digits as its factorization.

217172217005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523306635.

The product of its (nonzero) digits is 13720, while the sum is 35.

Adding to 217172217005 its reverse (500712271712), we get a palindrome (717884488717).

The spelling of 217172217005 in words is "two hundred seventeen billion, one hundred seventy-two million, two hundred seventeen thousand, five".