66666624223 has 4 divisors (see below), whose sum is σ = 67191558400. Its totient is φ = 66141690048.

The previous prime is 66666624191. The next prime is 66666624229. The reversal of 66666624223 is 32242666666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66666624223 - 2⁵ = 66666624191 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 (66666624229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262466898 + ... + 262467151.

It is an arithmetic number, because the mean of its divisors is an integer number (16797889600).

Almost surely, 2^66666624223 is an apocalyptic number.

66666624223 is a deficient number, since it is larger than the sum of its proper divisors (524934177).

66666624223 is a wasteful number, since it uses less digits than its factorization.

66666624223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524934176.

The product of its digits is 4478976, while the sum is 49.

The spelling of 66666624223 in words is "sixty-six billion, six hundred sixty-six million, six hundred twenty-four thousand, two hundred twenty-three".