666635333688 has 160 divisors (see below), whose sum is σ = 1916620833600. Its totient is φ = 216377941248.

The previous prime is 666635333677. The next prime is 666635333713. The reversal of 666635333688 is 886333536666.

It is a super-2 number, since 2×666635333688² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5944278 + ... + 6055386.

It is an arithmetic number, because the mean of its divisors is an integer number (11978880210).

Almost surely, 2^666635333688 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 666635333688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958310416800).

666635333688 is an abundant number, since it is smaller than the sum of its proper divisors (1249985499912).

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

666635333688 is a wasteful number, since it uses less digits than its factorization.

666635333688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111371 (or 111358 counting only the distinct ones).

The product of its digits is 201553920, while the sum is 63.

The spelling of 666635333688 in words is "six hundred sixty-six billion, six hundred thirty-five million, three hundred thirty-three thousand, six hundred eighty-eight".