216568225 has 6 divisors (see below), whose sum is σ = 268544630. Its totient is φ = 173254560.

The previous prime is 216568223. The next prime is 216568241. The reversal of 216568225 is 522865612.

It can be written as a sum of positive squares in 3 ways, for example, as 7569 + 216560656 = 87^2 + 14716^2 .

It is not a de Polignac number, because 216568225 - 2¹ = 216568223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216568223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4331340 + ... + 4331389.

Almost surely, 2^216568225 is an apocalyptic number.

216568225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216568225 is a deficient number, since it is larger than the sum of its proper divisors (51976405).

216568225 is an equidigital number, since it uses as much as digits as its factorization.

216568225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8662739 (or 8662734 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The square root of 216568225 is about 14716.2571668206. The cubic root of 216568225 is about 600.5256735703.

The spelling of 216568225 in words is "two hundred sixteen million, five hundred sixty-eight thousand, two hundred twenty-five".