217704660893 has 16 divisors (see below), whose sum is σ = 231365790720. Its totient is φ = 204264855216.

The previous prime is 217704660863. The next prime is 217704660919. The reversal of 217704660893 is 398066407712.

It is a cyclic number.

It is not a de Polignac number, because 217704660893 - 2⁸ = 217704660637 is a prime.

It is a super-2 number, since 2×217704660893² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217704660863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9101996 + ... + 9125882.

It is an arithmetic number, because the mean of its divisors is an integer number (14460361920).

Almost surely, 2^217704660893 is an apocalyptic number.

It is an amenable number.

217704660893 is a deficient number, since it is larger than the sum of its proper divisors (13661129827).

217704660893 is a wasteful number, since it uses less digits than its factorization.

217704660893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28496.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 217704660893 in words is "two hundred seventeen billion, seven hundred four million, six hundred sixty thousand, eight hundred ninety-three".