220560661 has 4 divisors (see below), whose sum is σ = 220984524. Its totient is φ = 220136800.

The previous prime is 220560649. The next prime is 220560673. The reversal of 220560661 is 166065022.

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

It is an interprime number because it is at equal distance from previous prime (220560649) and next prime (220560673).

It can be written as a sum of positive squares in 2 ways, for example, as 160807761 + 59752900 = 12681^2 + 7730^2 .

It is a cyclic number.

It is not a de Polignac number, because 220560661 - 2⁹ = 220560149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220560611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211150 + ... + 212191.

It is an arithmetic number, because the mean of its divisors is an integer number (55246131).

Almost surely, 2^220560661 is an apocalyptic number.

It is an amenable number.

220560661 is a deficient number, since it is larger than the sum of its proper divisors (423863).

220560661 is an equidigital number, since it uses as much as digits as its factorization.

220560661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423862.

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

The square root of 220560661 is about 14851.2848265731. The cubic root of 220560661 is about 604.1934575030.

The spelling of 220560661 in words is "two hundred twenty million, five hundred sixty thousand, six hundred sixty-one".