6666313889550 has 384 divisors, whose sum is σ = 20662564368384. Its totient is φ = 1387750440960.

The previous prime is 6666313889491. The next prime is 6666313889569. The reversal of 6666313889550 is 559883136666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 69013387 + ... + 69109913.

It is an arithmetic number, because the mean of its divisors is an integer number (53808761376).

Almost surely, 2^{6666313889550} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6666313889550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10331282184192).

6666313889550 is an abundant number, since it is smaller than the sum of its proper divisors (13996250478834).

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

6666313889550 is a wasteful number, since it uses less digits than its factorization.

6666313889550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96692 (or 96687 counting only the distinct ones).

The product of its (nonzero) digits is 167961600, while the sum is 66.

The spelling of 6666313889550 in words is "six trillion, six hundred sixty-six billion, three hundred thirteen million, eight hundred eighty-nine thousand, five hundred fifty".