66143645221166 has 32 divisors (see below), whose sum is σ = 104547531833280. Its totient is φ = 31339221984000.

The previous prime is 66143645221117. The next prime is 66143645221189. The reversal of 66143645221166 is 66112254634166.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 18837410 + ... + 22071141.

It is an arithmetic number, because the mean of its divisors is an integer number (3267110369790).

Almost surely, 2^{66143645221166} is an apocalyptic number.

66143645221166 is a deficient number, since it is larger than the sum of its proper divisors (38403886612114).

66143645221166 is a wasteful number, since it uses less digits than its factorization.

66143645221166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40909100.

The product of its digits is 7464960, while the sum is 53.

The spelling of 66143645221166 in words is "sixty-six trillion, one hundred forty-three billion, six hundred forty-five million, two hundred twenty-one thousand, one hundred sixty-six".