220718161 has 2 divisors, whose sum is σ = 220718162. Its totient is φ = 220718160.

The previous prime is 220718153. The next prime is 220718177. The reversal of 220718161 is 161817022.

220718161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136445761 + 84272400 = 11681^2 + 9180^2 .

It is a cyclic number.

It is not a de Polignac number, because 220718161 - 2³ = 220718153 is a prime.

It is not a weakly prime, because it can be changed into another prime (220718111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110359080 + 110359081.

It is an arithmetic number, because the mean of its divisors is an integer number (110359081).

Almost surely, 2^220718161 is an apocalyptic number.

It is an amenable number.

220718161 is a deficient number, since it is larger than the sum of its proper divisors (1).

220718161 is an equidigital number, since it uses as much as digits as its factorization.

220718161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 220718161 is about 14856.5864518065. The cubic root of 220718161 is about 604.3372393044.

The spelling of 220718161 in words is "two hundred twenty million, seven hundred eighteen thousand, one hundred sixty-one".