66185143 has 2 divisors, whose sum is σ = 66185144. Its totient is φ = 66185142.

The previous prime is 66185101. The next prime is 66185159. The reversal of 66185143 is 34158166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66185143 - 2⁹ = 66184631 is a prime.

It is a super-3 number, since 3×66185143³ (a number of 24 digits) contains 333 as substring.

It is equal to p_3906457 and since 66185143 and 3906457 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 66185099 and 66185108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66185443) 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, 33092571 + 33092572.

It is an arithmetic number, because the mean of its divisors is an integer number (33092572).

Almost surely, 2^66185143 is an apocalyptic number.

66185143 is a deficient number, since it is larger than the sum of its proper divisors (1).

66185143 is an equidigital number, since it uses as much as digits as its factorization.

66185143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 66185143 is about 8135.4251886426. The cubic root of 66185143 is about 404.5015317423.

The spelling of 66185143 in words is "sixty-six million, one hundred eighty-five thousand, one hundred forty-three".