220006565 has 8 divisors (see below), whose sum is σ = 268336248. Its totient is φ = 173119680.

The previous prime is 220006561. The next prime is 220006603. The reversal of 220006565 is 565600022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15888196 + 204118369 = 3986^2 + 14287^2 .

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

It is not a de Polignac number, because 220006565 - 2² = 220006561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220006561) 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, 360362 + ... + 360971.

It is an arithmetic number, because the mean of its divisors is an integer number (33542031).

Almost surely, 2^220006565 is an apocalyptic number.

It is an amenable number.

220006565 is a deficient number, since it is larger than the sum of its proper divisors (48329683).

220006565 is an equidigital number, since it uses as much as digits as its factorization.

220006565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721399.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 220006565 is about 14832.6182786452. The cubic root of 220006565 is about 603.6870784174.

Adding to 220006565 its reverse (565600022), we get a palindrome (785606587).

The spelling of 220006565 in words is "two hundred twenty million, six thousand, five hundred sixty-five".