216555 has 8 divisors (see below), whose sum is σ = 346512. Its totient is φ = 115488.

The previous prime is 216553. The next prime is 216569. The reversal of 216555 is 555612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216555 - 2¹ = 216553 is a prime.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (216551) 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, 7204 + ... + 7233.

It is an arithmetic number, because the mean of its divisors is an integer number (43314).

2²¹⁶⁵⁵⁵ is an apocalyptic number.

216555 is a deficient number, since it is larger than the sum of its proper divisors (129957).

216555 is a wasteful number, since it uses less digits than its factorization.

216555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14445.

The product of its digits is 1500, while the sum is 24.

The square root of 216555 is about 465.3547034252. The cubic root of 216555 is about 60.0513449380.

The spelling of 216555 in words is "two hundred sixteen thousand, five hundred fifty-five".