217666066063 has 16 divisors (see below), whose sum is σ = 234995040000. Its totient is φ = 200858216832.

The previous prime is 217666066049. The next prime is 217666066067. The reversal of 217666066063 is 360660666712.

It is a cyclic number.

It is not a de Polignac number, because 217666066063 - 2¹⁷ = 217665934991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217666065998 and 217666066016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217666066067) 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, 93838 + ... + 666436.

It is an arithmetic number, because the mean of its divisors is an integer number (14687190000).

Almost surely, 2^217666066063 is an apocalyptic number.

217666066063 is a deficient number, since it is larger than the sum of its proper divisors (17328973937).

217666066063 is a wasteful number, since it uses less digits than its factorization.

217666066063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573054.

The product of its (nonzero) digits is 1959552, while the sum is 49.

The spelling of 217666066063 in words is "two hundred seventeen billion, six hundred sixty-six million, sixty-six thousand, sixty-three".