220766881 has 2 divisors, whose sum is σ = 220766882. Its totient is φ = 220766880.

The previous prime is 220766873. The next prime is 220766891. The reversal of 220766881 is 188667022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130896481 + 89870400 = 11441^2 + 9480^2 .

It is a cyclic number.

It is not a de Polignac number, because 220766881 - 2³ = 220766873 is a prime.

It is a super-2 number, since 2×220766881² = 97476031492936322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (220766831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110383440 + 110383441.

It is an arithmetic number, because the mean of its divisors is an integer number (110383441).

Almost surely, 2^220766881 is an apocalyptic number.

It is an amenable number.

220766881 is a deficient number, since it is larger than the sum of its proper divisors (1).

220766881 is an equidigital number, since it uses as much as digits as its factorization.

220766881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 220766881 is about 14858.2260381245. The cubic root of 220766881 is about 604.3817019562.

The spelling of 220766881 in words is "two hundred twenty million, seven hundred sixty-six thousand, eight hundred eighty-one".