220661065 has 4 divisors (see below), whose sum is σ = 264793284. Its totient is φ = 176528848.

The previous prime is 220661059. The next prime is 220661137. The reversal of 220661065 is 560166022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 169338169 + 51322896 = 13013^2 + 7164^2 .

It is a cyclic number.

It is not a de Polignac number, because 220661065 - 2¹⁷ = 220529993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22066102 + ... + 22066111.

It is an arithmetic number, because the mean of its divisors is an integer number (66198321).

Almost surely, 2^220661065 is an apocalyptic number.

It is an amenable number.

220661065 is a deficient number, since it is larger than the sum of its proper divisors (44132219).

220661065 is an equidigital number, since it uses as much as digits as its factorization.

220661065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44132218.

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

The square root of 220661065 is about 14854.6647555574. The cubic root of 220661065 is about 604.2851242533.

The spelling of 220661065 in words is "two hundred twenty million, six hundred sixty-one thousand, sixty-five".