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66500000 = 2556719
BaseRepresentation
bin1111110110101…
…1010110100000
311122010112211222
43331223112200
5114011000000
610333154212
71435145360
oct375532640
9148115758
1066500000
11345a0486
121a32b968
1310a14718
148b909a0
155c88a85
hex3f6b5a0

66500000 has 168 divisors, whose sum is σ = 196872480. Its totient is φ = 21600000.

The previous prime is 66499967. The next prime is 66500003. The reversal of 66500000 is 566.

It is a happy number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66500003) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3499991 + ... + 3500009.

It is an arithmetic number, because the mean of its divisors is an integer number (1171860).

Almost surely, 266500000 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 66500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98436240).

66500000 is an abundant number, since it is smaller than the sum of its proper divisors (130372480).

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

66500000 is an frugal number, since it uses more digits than its factorization.

66500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 66500000 is about 8154.7532151500. The cubic root of 66500000 is about 405.1419509522.

Adding to 66500000 its reverse (566), we get a palindrome (66500566).

The spelling of 66500000 in words is "sixty-six million, five hundred thousand".