7666181 has 2 divisors, whose sum is σ = 7666182. Its totient is φ = 7666180.

The previous prime is 7666171. The next prime is 7666213. The reversal of 7666181 is 1816667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5313025 + 2353156 = 2305^2 + 1534^2 .

It is a cyclic number.

It is not a de Polignac number, because 7666181 - 2⁶ = 7666117 is a prime.

It is a super-2 number, since 2×7666181² = 117540662249522, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7666151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3833090 + 3833091.

It is an arithmetic number, because the mean of its divisors is an integer number (3833091).

Almost surely, 2^7666181 is an apocalyptic number.

It is an amenable number.

7666181 is a deficient number, since it is larger than the sum of its proper divisors (1).

7666181 is an equidigital number, since it uses as much as digits as its factorization.

7666181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 7666181 is about 2768.7869184898. The cubic root of 7666181 is about 197.1785595365.

The spelling of 7666181 in words is "seven million, six hundred sixty-six thousand, one hundred eighty-one".