66123223939 has 8 divisors (see below), whose sum is σ = 69809938640. Its totient is φ = 62457163776.

The previous prime is 66123223927. The next prime is 66123223949. The reversal of 66123223939 is 93932232166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66123223939 - 2¹¹ = 66123221891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66123223909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5157054 + ... + 5169859.

It is an arithmetic number, because the mean of its divisors is an integer number (8726242330).

Almost surely, 2^66123223939 is an apocalyptic number.

66123223939 is a deficient number, since it is larger than the sum of its proper divisors (3686714701).

66123223939 is a wasteful number, since it uses less digits than its factorization.

66123223939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10327269.

The product of its digits is 629856, while the sum is 46.

The spelling of 66123223939 in words is "sixty-six billion, one hundred twenty-three million, two hundred twenty-three thousand, nine hundred thirty-nine".