220220220661 has 4 divisors (see below), whose sum is σ = 251680252192. Its totient is φ = 188760189132.

The previous prime is 220220220653. The next prime is 220220220719. The reversal of 220220220661 is 166022022022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220220220661 - 2³ = 220220220653 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 (220220220601) 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, 15730015755 + ... + 15730015768.

It is an arithmetic number, because the mean of its divisors is an integer number (62920063048).

Almost surely, 2^220220220661 is an apocalyptic number.

It is an amenable number.

220220220661 is a deficient number, since it is larger than the sum of its proper divisors (31460031531).

220220220661 is an equidigital number, since it uses as much as digits as its factorization.

220220220661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31460031530.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 220220220661 its reverse (166022022022), we get a palindrome (386242242683).

The spelling of 220220220661 in words is "two hundred twenty billion, two hundred twenty million, two hundred twenty thousand, six hundred sixty-one".