8221080660 has 192 divisors, whose sum is σ = 27154310400. Its totient is φ = 1838850048.

The previous prime is 8221080649. The next prime is 8221080697. The reversal of 8221080660 is 660801228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 373851 + ... + 395229.

It is an arithmetic number, because the mean of its divisors is an integer number (141428700).

Almost surely, 2^8221080660 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 8221080660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13577155200).

8221080660 is an abundant number, since it is smaller than the sum of its proper divisors (18933229740).

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

8221080660 is a wasteful number, since it uses less digits than its factorization.

8221080660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21450 (or 21448 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 8221080660 is about 90670.1751404507. The cubic root of 8221080660 is about 2018.2562362012.

Adding to 8221080660 its reverse (660801228), we get a palindrome (8881881888).

The spelling of 8221080660 in words is "eight billion, two hundred twenty-one million, eighty thousand, six hundred sixty".