666688888890000 has 800 divisors, whose sum is σ = 2575751655628800. Its totient is φ = 164568317760000.

The previous prime is 666688888889987. The next prime is 666688888890019. The reversal of 666688888890000 is 98888886666.

It is a junction number, because it is equal to n+sod(n) for n = 666688888889892 and 666688888889901.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 190778431 + ... + 194241569.

It is an arithmetic number, because the mean of its divisors is an integer number (3219689569536).

Almost surely, 2^{666688888890000} is an apocalyptic number.

666688888890000 is a gapful number since it is divisible by the number (60) 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 666688888890000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1287875827814400).

666688888890000 is an abundant number, since it is smaller than the sum of its proper divisors (1909062766738800).

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

666688888890000 is a wasteful number, since it uses less digits than its factorization.

666688888890000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3463230 (or 3463203 counting only the distinct ones).

The product of its (nonzero) digits is 3057647616, while the sum is 81.

The spelling of 666688888890000 in words is "six hundred sixty-six trillion, six hundred eighty-eight billion, eight hundred eighty-eight million, eight hundred ninety thousand".