216535653 has 8 divisors (see below), whose sum is σ = 320793600. Its totient is φ = 144357084.

The previous prime is 216535621. The next prime is 216535667. The reversal of 216535653 is 356535612.

It is not a de Polignac number, because 216535653 - 2⁵ = 216535621 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216530653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4009893 + ... + 4009946.

It is an arithmetic number, because the mean of its divisors is an integer number (40099200).

Almost surely, 2^216535653 is an apocalyptic number.

It is an amenable number.

216535653 is a deficient number, since it is larger than the sum of its proper divisors (104257947).

216535653 is an equidigital number, since it uses as much as digits as its factorization.

216535653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8019848 (or 8019842 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 216535653 is about 14715.1504579464. The cubic root of 216535653 is about 600.4955655786.

The spelling of 216535653 in words is "two hundred sixteen million, five hundred thirty-five thousand, six hundred fifty-three".