216535590871 has 4 divisors (see below), whose sum is σ = 218451835152. Its totient is φ = 214619346592.

The previous prime is 216535590833. The next prime is 216535590881. The reversal of 216535590871 is 178095535612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216535590871 - 2⁷ = 216535590743 is a prime.

It is a super-2 number, since 2×216535590871² (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 (216535590881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 958121971 + ... + 958122196.

It is an arithmetic number, because the mean of its divisors is an integer number (54612958788).

Almost surely, 2^216535590871 is an apocalyptic number.

216535590871 is a deficient number, since it is larger than the sum of its proper divisors (1916244281).

216535590871 is a wasteful number, since it uses less digits than its factorization.

216535590871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916244280.

The product of its (nonzero) digits is 2268000, while the sum is 52.

The spelling of 216535590871 in words is "two hundred sixteen billion, five hundred thirty-five million, five hundred ninety thousand, eight hundred seventy-one".