66668888890000 has 100 divisors (see below), whose sum is σ = 161500246378240. Its totient is φ = 26652983760000.

The previous prime is 66668888889991. The next prime is 66668888890001. The reversal of 66668888890000 is 9888886666.

It is a tau number, because it is divible by the number of its divisors (100).

It is a junction number, because it is equal to n+sod(n) for n = 66668888889896 and 66668888889905.

It is not an unprimeable number, because it can be changed into a prime (66668888890001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16489441 + ... + 20130559.

Almost surely, 2^{66668888890000} 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 66668888890000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80750123189120).

66668888890000 is an abundant number, since it is smaller than the sum of its proper divisors (94831357488240).

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

66668888890000 is a wasteful number, since it uses less digits than its factorization.

66668888890000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642978 (or 3642957 counting only the distinct ones).

The product of its (nonzero) digits is 382205952, while the sum is 73.

The spelling of 66668888890000 in words is "sixty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, eight hundred ninety thousand".