217803252585 has 16 divisors (see below), whose sum is σ = 348512194944. Its totient is φ = 116152737792.

The previous prime is 217803252529. The next prime is 217803252587. The reversal of 217803252585 is 585252308712.

It is not a de Polignac number, because 217803252585 - 2¹¹ = 217803250537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217803252587) 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, 359832 + ... + 751721.

It is an arithmetic number, because the mean of its divisors is an integer number (21782012184).

Almost surely, 2^217803252585 is an apocalyptic number.

It is an amenable number.

217803252585 is a deficient number, since it is larger than the sum of its proper divisors (130708942359).

217803252585 is a wasteful number, since it uses less digits than its factorization.

217803252585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124624.

The product of its (nonzero) digits is 1344000, while the sum is 48.

The spelling of 217803252585 in words is "two hundred seventeen billion, eight hundred three million, two hundred fifty-two thousand, five hundred eighty-five".