220255561 has 8 divisors (see below), whose sum is σ = 229397184. Its totient is φ = 211281840.

The previous prime is 220255531. The next prime is 220255573. The reversal of 220255561 is 165552022.

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

It is not a de Polignac number, because 220255561 - 2⁷ = 220255433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220255501) 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, 39295 + ... + 44548.

It is an arithmetic number, because the mean of its divisors is an integer number (28674648).

Almost surely, 2^220255561 is an apocalyptic number.

It is an amenable number.

220255561 is a deficient number, since it is larger than the sum of its proper divisors (9141623).

220255561 is an equidigital number, since it uses as much as digits as its factorization.

220255561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83951.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 220255561 is about 14841.0094333236. The cubic root of 220255561 is about 603.9147367693.

The spelling of 220255561 in words is "two hundred twenty million, two hundred fifty-five thousand, five hundred sixty-one".