206766181 has 2 divisors, whose sum is σ = 206766182. Its totient is φ = 206766180.

The previous prime is 206766163. The next prime is 206766199. The reversal of 206766181 is 181667602.

It is a balanced prime because it is at equal distance from previous prime (206766163) and next prime (206766199).

It can be written as a sum of positive squares in only one way, i.e., 202806081 + 3960100 = 14241^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 206766181 - 2¹⁷ = 206635109 is a prime.

It is a super-2 number, since 2×206766181² = 85504507210649522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206766181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206736181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103383090 + 103383091.

It is an arithmetic number, because the mean of its divisors is an integer number (103383091).

Almost surely, 2^206766181 is an apocalyptic number.

It is an amenable number.

206766181 is a deficient number, since it is larger than the sum of its proper divisors (1).

206766181 is an equidigital number, since it uses as much as digits as its factorization.

206766181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 206766181 is about 14379.3665020403. The cubic root of 206766181 is about 591.3253562620.

The spelling of 206766181 in words is "two hundred six million, seven hundred sixty-six thousand, one hundred eighty-one".