660221176320 has 800 divisors, whose sum is σ = 2455537835520. Its totient is φ = 169418096640.

The previous prime is 660221176309. The next prime is 660221176327. The reversal of 660221176320 is 23671122066.

660221176320 is a `hidden beast` number, since 6 + 6 + 0 + 2 + 2 + 1 + 17 + 632 + 0 = 666.

It is a super-2 number, since 2×660221176320² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (660221176327) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 671638549 + ... + 671639531.

Almost surely, 2^660221176320 is an apocalyptic number.

660221176320 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 660221176320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1227768917760).

660221176320 is an abundant number, since it is smaller than the sum of its proper divisors (1795316659200).

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

660221176320 is an equidigital number, since it uses as much as digits as its factorization.

660221176320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138 (or 1113 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

Adding to 660221176320 its reverse (23671122066), we get a palindrome (683892298386).

The spelling of 660221176320 in words is "six hundred sixty billion, two hundred twenty-one million, one hundred seventy-six thousand, three hundred twenty".