117666181 has 2 divisors, whose sum is σ = 117666182. Its totient is φ = 117666180.

The previous prime is 117666161. The next prime is 117666191. The reversal of 117666181 is 181666711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113529025 + 4137156 = 10655^2 + 2034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117666181 is a prime.

It is a super-2 number, since 2×117666181² = 27690660302249522, 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 117666181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117666121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58833090 + 58833091.

It is an arithmetic number, because the mean of its divisors is an integer number (58833091).

Almost surely, 2^117666181 is an apocalyptic number.

It is an amenable number.

117666181 is a deficient number, since it is larger than the sum of its proper divisors (1).

117666181 is an equidigital number, since it uses as much as digits as its factorization.

117666181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 37.

The square root of 117666181 is about 10847.4043438972. The cubic root of 117666181 is about 490.0238514004.

The spelling of 117666181 in words is "one hundred seventeen million, six hundred sixty-six thousand, one hundred eighty-one".