218066081 has 2 divisors, whose sum is σ = 218066082. Its totient is φ = 218066080.

The previous prime is 218066071. The next prime is 218066143. The reversal of 218066081 is 180660812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192654400 + 25411681 = 13880^2 + 5041^2 .

It is a cyclic number.

It is not a de Polignac number, because 218066081 - 2¹⁴ = 218049697 is a prime.

It is a super-2 number, since 2×218066081² = 95105631365397122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (218066011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109033040 + 109033041.

It is an arithmetic number, because the mean of its divisors is an integer number (109033041).

Almost surely, 2^218066081 is an apocalyptic number.

It is an amenable number.

218066081 is a deficient number, since it is larger than the sum of its proper divisors (1).

218066081 is an equidigital number, since it uses as much as digits as its factorization.

218066081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 218066081 is about 14767.0606757066. The cubic root of 218066081 is about 601.9069706468.

The spelling of 218066081 in words is "two hundred eighteen million, sixty-six thousand, eighty-one".