217011704663 has 20 divisors (see below), whose sum is σ = 235699874520. Its totient is φ = 199803475872.

The previous prime is 217011704593. The next prime is 217011704671. The reversal of 217011704663 is 366407110712.

It is not a de Polignac number, because 217011704663 - 2¹⁰ = 217011703639 is a prime.

It is a super-2 number, since 2×217011704663² (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 (217011704683) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11329148 + ... + 11348286.

It is an arithmetic number, because the mean of its divisors is an integer number (11784993726).

Almost surely, 2^217011704663 is an apocalyptic number.

217011704663 is a deficient number, since it is larger than the sum of its proper divisors (18688169857).

217011704663 is an frugal number, since it uses more digits than its factorization.

217011704663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19588 (or 19549 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 217011704663 in words is "two hundred seventeen billion, eleven million, seven hundred four thousand, six hundred sixty-three".