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655220000000 = 28571812
BaseRepresentation
bin10011000100011100010…
…01111100010100000000
32022122020102000200221102
421202032021330110000
541213342310000000
61221000502313532
765223651051446
oct11421611742400
92278212020842
10655220000000
11232971676935
12a6b9ba288a8
1349a2ccc6517
14239d9d82b96
151209cb243d5
hex988e27c500

655220000000 has 216 divisors, whose sum is σ = 1643928701688. Its totient is φ = 260640000000.

The previous prime is 655219999979. The next prime is 655220000089. The reversal of 655220000000 is 22556.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 12 ways, for example, as 984064 + 655219015936 = 992^2 + 809456^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3619999910 + ... + 3620000090.

Almost surely, 2655220000000 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 655220000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821964350844).

655220000000 is an abundant number, since it is smaller than the sum of its proper divisors (988708701688).

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

655220000000 is an frugal number, since it uses more digits than its factorization.

655220000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

Multiplying 655220000000 by its sum of digits (20), we get a square (13104400000000 = 36200002).

655220000000 divided by its sum of digits (20) gives a square (32761000000 = 1810002).

Adding to 655220000000 its reverse (22556), we get a palindrome (655220022556).

The spelling of 655220000000 in words is "six hundred fifty-five billion, two hundred twenty million", and thus it is an aban number.