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66600000999 = 32731372234133
BaseRepresentation
bin111110000001101010…
…110101110111100111
320100220110122121001200
4332001222311313213
52042344100012444
650332353053543
74545260445060
oct760152656747
9210813577050
1066600000999
1126276a67544
1210aa82572b3
136384c2211c
14331b249567
151aebda8969
hexf81ab5de7

66600000999 has 96 divisors (see below), whose sum is σ = 117107687424. Its totient is φ = 35664779520.

The previous prime is 66600000941. The next prime is 66600001001. The reversal of 66600000999 is 99900000666.

It is not a de Polignac number, because 66600000999 - 211 = 66599998951 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

66600000999 is a strobogrammatic number because it is the same when read upside-down.

66600000999 is a modest number, since divided by 999 gives 666 as remainder.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66600008999) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16112137 + ... + 16116269.

It is an arithmetic number, because the mean of its divisors is an integer number (1219871744).

Almost surely, 266600000999 is an apocalyptic number.

66600000999 is a deficient number, since it is larger than the sum of its proper divisors (50507686425).

66600000999 is a wasteful number, since it uses less digits than its factorization.

66600000999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437 (or 4434 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The spelling of 66600000999 in words is "sixty-six billion, six hundred million, nine hundred ninety-nine", and thus it is an aban number.

Divisors: 1 3 7 9 21 31 37 63 93 111 217 223 259 279 333 651 669 777 1147 1561 1953 2007 2331 3441 4133 4683 6913 8029 8251 10323 12399 14049 20739 24087 24753 28931 37197 48391 57757 62217 72261 74259 86793 128123 145173 152921 173271 255781 260379 384369 435519 458763 519813 767343 896861 921659 1070447 1153107 1376289 1790467 2302029 2690583 2764977 3211341 4740551 5371401 6451613 8071749 8294931 9634023 14221653 16114203 19354839 28571429 33183857 34101383 42664959 58064517 85714287 99551571 102304149 200000003 238709681 257142861 298654713 306912447 600000009 716129043 1057142873 1800000027 2148387129 3171428619 7400000111 9514285857 22200000333 66600000999