220650161 has 2 divisors, whose sum is σ = 220650162. Its totient is φ = 220650160.

The previous prime is 220650149. The next prime is 220650163. The reversal of 220650161 is 161056022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142945936 + 77704225 = 11956^2 + 8815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220650161 is a prime.

It is a Sophie Germain prime.

Together with 220650163, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (220650163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110325080 + 110325081.

It is an arithmetic number, because the mean of its divisors is an integer number (110325081).

Almost surely, 2^220650161 is an apocalyptic number.

It is an amenable number.

220650161 is a deficient number, since it is larger than the sum of its proper divisors (1).

220650161 is an equidigital number, since it uses as much as digits as its factorization.

220650161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 220650161 is about 14854.2977282671. The cubic root of 220650161 is about 604.2751704756.

The spelling of 220650161 in words is "two hundred twenty million, six hundred fifty thousand, one hundred sixty-one".