66140109 has 12 divisors (see below), whose sum is σ = 109183776. Its totient is φ = 37794312.

The previous prime is 66140101. The next prime is 66140119. The reversal of 66140109 is 90104166.

It is not a de Polignac number, because 66140109 - 2³ = 66140101 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66140101) 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 in 11 ways as a sum of consecutive naturals, for example, 524859 + ... + 524984.

It is an arithmetic number, because the mean of its divisors is an integer number (9098648).

Almost surely, 2^66140109 is an apocalyptic number.

It is an amenable number.

66140109 is a deficient number, since it is larger than the sum of its proper divisors (43043667).

66140109 is a wasteful number, since it uses less digits than its factorization.

66140109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049856 (or 1049853 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 66140109 is about 8132.6569459187. The cubic root of 66140109 is about 404.4097666606.

The spelling of 66140109 in words is "sixty-six million, one hundred forty thousand, one hundred nine".