66643665643166 has 16 divisors (see below), whose sum is σ = 102668050328256. Its totient is φ = 32420995913376.

The previous prime is 66643665643127. The next prime is 66643665643201. The reversal of 66643665643166 is 66134656634666.

It is a junction number, because it is equal to n+sod(n) for n = 66643665643096 and 66643665643105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6552320 + ... + 13274796.

It is an arithmetic number, because the mean of its divisors is an integer number (6416753145516).

Almost surely, 2^{66643665643166} is an apocalyptic number.

66643665643166 is a deficient number, since it is larger than the sum of its proper divisors (36024384685090).

66643665643166 is a wasteful number, since it uses less digits than its factorization.

66643665643166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6856483.

The product of its digits is 1209323520, while the sum is 68.

The spelling of 66643665643166 in words is "sixty-six trillion, six hundred forty-three billion, six hundred sixty-five million, six hundred forty-three thousand, one hundred sixty-six".