668444211238 has 8 divisors (see below), whose sum is σ = 1002672279432. Its totient is φ = 334220118096.

The previous prime is 668444211233. The next prime is 668444211247. The reversal of 668444211238 is 832112444866.

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

It is a junction number, because it is equal to n+sod(n) for n = 668444211191 and 668444211200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668444211233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530095 + ... + 1271962.

It is an arithmetic number, because the mean of its divisors is an integer number (125334034929).

Almost surely, 2^668444211238 is an apocalyptic number.

668444211238 is a deficient number, since it is larger than the sum of its proper divisors (334228068194).

668444211238 is a wasteful number, since it uses less digits than its factorization.

668444211238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1987526.

The product of its digits is 1769472, while the sum is 49.

The spelling of 668444211238 in words is "six hundred sixty-eight billion, four hundred forty-four million, two hundred eleven thousand, two hundred thirty-eight".