216606025 has 12 divisors (see below), whose sum is σ = 269644572. Its totient is φ = 172605440.

The previous prime is 216605989. The next prime is 216606053. The reversal of 216606025 is 520606612.

It can be written as a sum of positive squares in 6 ways, for example, as 45369 + 216560656 = 213^2 + 14716^2 .

It is not a de Polignac number, because 216606025 - 2¹⁵ = 216573257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216605984 and 216606002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10432 + ... + 23281.

It is an arithmetic number, because the mean of its divisors is an integer number (22470381).

Almost surely, 2^216606025 is an apocalyptic number.

216606025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216606025 is a deficient number, since it is larger than the sum of its proper divisors (53038547).

216606025 is a wasteful number, since it uses less digits than its factorization.

216606025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33980 (or 33975 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 216606025 is about 14717.5414047320. The cubic root of 216606025 is about 600.5606102896.

The spelling of 216606025 in words is "two hundred sixteen million, six hundred six thousand, twenty-five".