220265561 has 2 divisors, whose sum is σ = 220265562. Its totient is φ = 220265560.

The previous prime is 220265519. The next prime is 220265569. The reversal of 220265561 is 165562022.

220265561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201072400 + 19193161 = 14180^2 + 4381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220265561 is a prime.

It is not a weakly prime, because it can be changed into another prime (220265569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110132780 + 110132781.

It is an arithmetic number, because the mean of its divisors is an integer number (110132781).

Almost surely, 2^220265561 is an apocalyptic number.

It is an amenable number.

220265561 is a deficient number, since it is larger than the sum of its proper divisors (1).

220265561 is an equidigital number, since it uses as much as digits as its factorization.

220265561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 220265561 is about 14841.3463338068. The cubic root of 220265561 is about 603.9238762373.

The spelling of 220265561 in words is "two hundred twenty million, two hundred sixty-five thousand, five hundred sixty-one".