660550220 has 96 divisors (see below), whose sum is σ = 1558158336. Its totient is φ = 233164800.

The previous prime is 660550211. The next prime is 660550223. The reversal of 660550220 is 22055066.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 660550220.

It is not an unprimeable number, because it can be changed into a prime (660550223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1995455 + ... + 1995785.

It is an arithmetic number, because the mean of its divisors is an integer number (16230816).

Almost surely, 2^660550220 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 660550220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (779079168).

660550220 is an abundant number, since it is smaller than the sum of its proper divisors (897608116).

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

660550220 is a wasteful number, since it uses less digits than its factorization.

660550220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 660550220 is about 25701.1715686270. The cubic root of 660550220 is about 870.9006483122.

The spelling of 660550220 in words is "six hundred sixty million, five hundred fifty thousand, two hundred twenty".