66171759663 has 16 divisors (see below), whose sum is σ = 88583788160. Its totient is φ = 43937250336.

The previous prime is 66171759649. The next prime is 66171759679. The reversal of 66171759663 is 36695717166.

It is not a de Polignac number, because 66171759663 - 2²¹ = 66169662511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66171759263) by changing a digit.

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, 2194656 + ... + 2224602.

It is an arithmetic number, because the mean of its divisors is an integer number (5536486760).

Almost surely, 2^66171759663 is an apocalyptic number.

66171759663 is a deficient number, since it is larger than the sum of its proper divisors (22412028497).

66171759663 is a wasteful number, since it uses less digits than its factorization.

66171759663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32886.

The product of its digits is 8573040, while the sum is 57.

The spelling of 66171759663 in words is "sixty-six billion, one hundred seventy-one million, seven hundred fifty-nine thousand, six hundred sixty-three".