118666181 has 2 divisors, whose sum is σ = 118666182. Its totient is φ = 118666180.

The previous prime is 118666151. The next prime is 118666183. The reversal of 118666181 is 181666811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98109025 + 20557156 = 9905^2 + 4534^2 .

It is a cyclic number.

It is not a de Polignac number, because 118666181 - 2¹⁸ = 118404037 is a prime.

It is a super-2 number, since 2×118666181² = 28163325026249522, which contains 22 as substring.

Together with 118666183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (118666183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59333090 + 59333091.

It is an arithmetic number, because the mean of its divisors is an integer number (59333091).

Almost surely, 2^118666181 is an apocalyptic number.

It is an amenable number.

118666181 is a deficient number, since it is larger than the sum of its proper divisors (1).

118666181 is an equidigital number, since it uses as much as digits as its factorization.

118666181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 38.

The square root of 118666181 is about 10893.4008004847. The cubic root of 118666181 is about 491.4081126194.

The spelling of 118666181 in words is "one hundred eighteen million, six hundred sixty-six thousand, one hundred eighty-one".