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9999999666 = 23520576131
BaseRepresentation
bin10010101000000101…
…11110001010110010
3221210220202121200000
421110002332022302
5130434444442131
64332142410430
7502544410656
oct112402761262
927726677600
109999999666
114271814838
121b30b90a16
13c349ba287
146ac162a66
153d7dacce6
hex2540be2b2

9999999666 has 24 divisors (see below), whose sum is σ = 22469136144. Its totient is φ = 3333333060.

The previous prime is 9999999661. The next prime is 9999999673. The reversal of 9999999666 is 6669999999.

It is a super-2 number, since 2×99999996662 (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9999999661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10287580 + ... + 10288551.

It is an arithmetic number, because the mean of its divisors is an integer number (936214006).

Almost surely, 29999999666 is an apocalyptic number.

9999999666 is an abundant number, since it is smaller than the sum of its proper divisors (12469136478).

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

9999999666 is a wasteful number, since it uses less digits than its factorization.

9999999666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20576148 (or 20576136 counting only the distinct ones).

The product of its digits is 1033121304, while the sum is 81.

The square root of 9999999666 is about 99999.9983300000. The cubic root of 9999999666 is about 2154.4346660458.

The spelling of 9999999666 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred sixty-six".

Divisors: 1 2 3 6 9 18 27 54 81 162 243 486 20576131 41152262 61728393 123456786 185185179 370370358 555555537 1111111074 1666666611 3333333222 4999999833 9999999666