666663333336 has 1024 divisors, whose sum is σ = 2574028800000. Its totient is φ = 154278328320.

The previous prime is 666663333331. The next prime is 666663333361. The reversal of 666663333336 is 633333366666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666663333331) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 1335998415 + ... + 1335998913.

It is an arithmetic number, because the mean of its divisors is an integer number (2513700000).

Almost surely, 2^666663333336 is an apocalyptic number.

666663333336 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666663333336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1287014400000).

666663333336 is an abundant number, since it is smaller than the sum of its proper divisors (1907365466664).

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

666663333336 is a wasteful number, since it uses less digits than its factorization.

666663333336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749 (or 739 counting only the distinct ones).

The product of its digits is 34012224, while the sum is 54.

It can be divided in two parts, 666663 and 333336, that added together give a palindrome (999999).

The spelling of 666663333336 in words is "six hundred sixty-six billion, six hundred sixty-three million, three hundred thirty-three thousand, three hundred thirty-six".