66185144 has 8 divisors (see below), whose sum is σ = 124097160. Its totient is φ = 33092568.

The previous prime is 66185143. The next prime is 66185159. The reversal of 66185144 is 44158166.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66185143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4136564 + ... + 4136579.

It is an arithmetic number, because the mean of its divisors is an integer number (15512145).

Almost surely, 2^66185144 is an apocalyptic number.

It is an amenable number.

66185144 is a deficient number, since it is larger than the sum of its proper divisors (57912016).

66185144 is a wasteful number, since it uses less digits than its factorization.

66185144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8273149 (or 8273145 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 66185144 is about 8135.4252501022. The cubic root of 66185144 is about 404.5015337795.

The spelling of 66185144 in words is "sixty-six million, one hundred eighty-five thousand, one hundred forty-four".