666235335312 has 240 divisors, whose sum is σ = 1997507865600. Its totient is φ = 206676852480.

The previous prime is 666235335289. The next prime is 666235335313. The reversal of 666235335312 is 213533532666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (666235335313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54968389 + ... + 54980507.

It is an arithmetic number, because the mean of its divisors is an integer number (8322949440).

Almost surely, 2^666235335312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666235335312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (998753932800).

666235335312 is an abundant number, since it is smaller than the sum of its proper divisors (1331272530288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666235335312 is a wasteful number, since it uses less digits than its factorization.

666235335312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12506 (or 12497 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 45.

Adding to 666235335312 its reverse (213533532666), we get a palindrome (879768867978).

The spelling of 666235335312 in words is "six hundred sixty-six billion, two hundred thirty-five million, three hundred thirty-five thousand, three hundred twelve".