66486181 has 2 divisors, whose sum is σ = 66486182. Its totient is φ = 66486180.

The previous prime is 66486143. The next prime is 66486193. The reversal of 66486181 is 18168466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58277956 + 8208225 = 7634^2 + 2865^2 .

It is a cyclic number.

It is not a de Polignac number, because 66486181 - 2⁷ = 66486053 is a prime.

It is a super-2 number, since 2×66486181² = 8840824527929522, which contains 22 as substring.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66486281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33243090 + 33243091.

It is an arithmetic number, because the mean of its divisors is an integer number (33243091).

Almost surely, 2^66486181 is an apocalyptic number.

It is an amenable number.

66486181 is a deficient number, since it is larger than the sum of its proper divisors (1).

66486181 is an equidigital number, since it uses as much as digits as its factorization.

66486181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The square root of 66486181 is about 8153.9058738742. The cubic root of 66486181 is about 405.1138855664.

The spelling of 66486181 in words is "sixty-six million, four hundred eighty-six thousand, one hundred eighty-one".