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9999999665 = 510271194723
BaseRepresentation
bin10010101000000101…
…11110001010110001
3221210220202121122222
421110002332022301
5130434444442130
64332142410425
7502544410655
oct112402761261
927726677588
109999999665
114271814837
121b30b90a15
13c349ba286
146ac162a65
153d7dacce5
hex2540be2b1

9999999665 has 8 divisors (see below), whose sum is σ = 12001229568. Its totient is φ = 7999179760.

The previous prime is 9999999661. The next prime is 9999999673. The reversal of 9999999665 is 5669999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9999999665 - 22 = 9999999661 is a prime.

It is a super-2 number, since 2×99999996652 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9999999665.

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 7 ways as a sum of consecutive naturals, for example, 46007 + ... + 148716.

It is an arithmetic number, because the mean of its divisors is an integer number (1500153696).

Almost surely, 29999999665 is an apocalyptic number.

It is an amenable number.

9999999665 is a deficient number, since it is larger than the sum of its proper divisors (2001229903).

9999999665 is a wasteful number, since it uses less digits than its factorization.

9999999665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204999.

The product of its digits is 860934420, while the sum is 80.

The square root of 9999999665 is about 99999.9983250000. The cubic root of 9999999665 is about 2154.4346659740.

The spelling of 9999999665 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred sixty-five".

Divisors: 1 5 10271 51355 194723 973615 1999999933 9999999665