66805171334 has 16 divisors (see below), whose sum is σ = 110221008336. Its totient is φ = 30365985760.

The previous prime is 66805171333. The next prime is 66805171373. The reversal of 66805171334 is 43317150866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66805171333) 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 7 ways as a sum of consecutive naturals, for example, 12545267 + ... + 12550590.

It is an arithmetic number, because the mean of its divisors is an integer number (6888813021).

Almost surely, 2^66805171334 is an apocalyptic number.

66805171334 is a deficient number, since it is larger than the sum of its proper divisors (43415837002).

66805171334 is a wasteful number, since it uses less digits than its factorization.

66805171334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25095892 (or 25095870 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 66805171334 in words is "sixty-six billion, eight hundred five million, one hundred seventy-one thousand, three hundred thirty-four".