216603 has 12 divisors (see below), whose sum is σ = 321048. Its totient is φ = 140640.

The previous prime is 216577. The next prime is 216607. The reversal of 216603 is 306612.

It is a happy number.

216603 is a `hidden beast` number, since 2 + 1 + 660 + 3 = 666.

It is not a de Polignac number, because 216603 - 2⁵ = 216571 is a prime.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216603.

It is not an unprimeable number, because it can be changed into a prime (216607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 76 + ... + 662.

It is an arithmetic number, because the mean of its divisors is an integer number (26754).

2²¹⁶⁶⁰³ is an apocalyptic number.

216603 is a deficient number, since it is larger than the sum of its proper divisors (104445).

216603 is a wasteful number, since it uses less digits than its factorization.

216603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 216603 is about 465.4062741305. The cubic root of 216603 is about 60.0557814577.

Subtracting 216603 from its reverse (306612), we obtain a palindrome (90009).

It can be divided in two parts, 21660 and 3, that multiplied together give a triangular number (64980 = T₃₆₀).

The spelling of 216603 in words is "two hundred sixteen thousand, six hundred three".