8666166357720 has 768 divisors, whose sum is σ = 31962731673600. Its totient is φ = 2104924631040.

The previous prime is 8666166357649. The next prime is 8666166357841. The reversal of 8666166357720 is 277536616668.

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, 473267365 + ... + 473285675.

It is an arithmetic number, because the mean of its divisors is an integer number (41618140200).

Almost surely, 2^{8666166357720} 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 8666166357720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15981365836800).

8666166357720 is an abundant number, since it is smaller than the sum of its proper divisors (23296565315880).

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

8666166357720 is a wasteful number, since it uses less digits than its factorization.

8666166357720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18462 (or 18446 counting only the distinct ones).

The product of its (nonzero) digits is 91445760, while the sum is 63.

The spelling of 8666166357720 in words is "eight trillion, six hundred sixty-six billion, one hundred sixty-six million, three hundred fifty-seven thousand, seven hundred twenty".