220206665 has 8 divisors (see below), whose sum is σ = 301997760. Its totient is φ = 150998832.

The previous prime is 220206641. The next prime is 220206667. The reversal of 220206665 is 566602022.

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

It is a cyclic number.

It is not a de Polignac number, because 220206665 - 2¹⁴ = 220190281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220206667) 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, 3145775 + ... + 3145844.

It is an arithmetic number, because the mean of its divisors is an integer number (37749720).

Almost surely, 2^220206665 is an apocalyptic number.

It is an amenable number.

220206665 is a deficient number, since it is larger than the sum of its proper divisors (81791095).

220206665 is an equidigital number, since it uses as much as digits as its factorization.

220206665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6291631.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 220206665 is about 14839.3620145881. The cubic root of 220206665 is about 603.8700444428.

Adding to 220206665 its reverse (566602022), we get a palindrome (786808687).

The spelling of 220206665 in words is "two hundred twenty million, two hundred six thousand, six hundred sixty-five".