217489073265 has 12 divisors (see below), whose sum is σ = 376981060404. Its totient is φ = 115994172384.

The previous prime is 217489073231. The next prime is 217489073273. The reversal of 217489073265 is 562370984712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 47412014049 + 170077059216 = 217743^2 + 412404^2 .

It is not a de Polignac number, because 217489073265 - 2⁹ = 217489072753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2416545214 + ... + 2416545303.

It is an arithmetic number, because the mean of its divisors is an integer number (31415088367).

It is a 1-persistent number, because it is pandigital, but 2⋅217489073265 = 434978146530 is not.

Almost surely, 2^217489073265 is an apocalyptic number.

It is an amenable number.

217489073265 is a deficient number, since it is larger than the sum of its proper divisors (159491987139).

217489073265 is a wasteful number, since it uses less digits than its factorization.

217489073265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4833090528 (or 4833090525 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 217489073265 in words is "two hundred seventeen billion, four hundred eighty-nine million, seventy-three thousand, two hundred sixty-five".