216536225 has 24 divisors (see below), whose sum is σ = 285169248. Its totient is φ = 162540800.

The previous prime is 216536219. The next prime is 216536227. The reversal of 216536225 is 522635612.

It is not a de Polignac number, because 216536225 - 2¹⁰ = 216535201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216536191 and 216536200.

It is not an unprimeable number, because it can be changed into a prime (216536227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 197930 + ... + 199020.

It is an arithmetic number, because the mean of its divisors is an integer number (11882052).

Almost surely, 2^216536225 is an apocalyptic number.

216536225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216536225 is a deficient number, since it is larger than the sum of its proper divisors (68633023).

216536225 is a wasteful number, since it uses less digits than its factorization.

216536225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585 (or 1580 counting only the distinct ones).

The product of its digits is 21600, while the sum is 32.

The square root of 216536225 is about 14715.1698936845. The cubic root of 216536225 is about 600.4960943339.

The spelling of 216536225 in words is "two hundred sixteen million, five hundred thirty-six thousand, two hundred twenty-five".