66243316744171 has 16 divisors (see below), whose sum is σ = 75892826553280. Its totient is φ = 56640355591680.

The previous prime is 66243316744061. The next prime is 66243316744193. The reversal of 66243316744171 is 17144761334266.

It is not a de Polignac number, because 66243316744171 - 2³¹ = 66241169260523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66243316744571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293049631 + ... + 293275591.

It is an arithmetic number, because the mean of its divisors is an integer number (4743301659580).

Almost surely, 2^{66243316744171} is an apocalyptic number.

66243316744171 is a deficient number, since it is larger than the sum of its proper divisors (9649509809109).

66243316744171 is a wasteful number, since it uses less digits than its factorization.

66243316744171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328774.

The product of its digits is 12192768, while the sum is 55.

The spelling of 66243316744171 in words is "sixty-six trillion, two hundred forty-three billion, three hundred sixteen million, seven hundred forty-four thousand, one hundred seventy-one".