66717644012223 has 16 divisors (see below), whose sum is σ = 89725495051776. Its totient is φ = 44094975768000.

The previous prime is 66717644012207. The next prime is 66717644012359. The reversal of 66717644012223 is 32221044671766.

It is not a de Polignac number, because 66717644012223 - 2⁴ = 66717644012207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66717644012203) 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, 107767261 + ... + 108384582.

It is an arithmetic number, because the mean of its divisors is an integer number (5607843440736).

Almost surely, 2^{66717644012223} is an apocalyptic number.

66717644012223 is a deficient number, since it is larger than the sum of its proper divisors (23007851039553).

66717644012223 is a wasteful number, since it uses less digits than its factorization.

66717644012223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216152734.

The product of its (nonzero) digits is 4064256, while the sum is 51.

Adding to 66717644012223 its reverse (32221044671766), we get a palindrome (98938688683989).

The spelling of 66717644012223 in words is "sixty-six trillion, seven hundred seventeen billion, six hundred forty-four million, twelve thousand, two hundred twenty-three".