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666650565 = 32572116351
BaseRepresentation
bin100111101111000…
…100011111000101
31201110102100122200
4213233010133011
52331130304230
6150052345113
722343302440
oct4757043705
91643370580
10666650565
11312341489
12167315199
13a81639b9
1464776657
153d7d6160
hex27bc47c5

666650565 has 24 divisors (see below), whose sum is σ = 1320603648. Its totient is φ = 304754400.

The previous prime is 666650557. The next prime is 666650599. The reversal of 666650565 is 565056666.

It is not a de Polignac number, because 666650565 - 23 = 666650557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 666650565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1057861 + ... + 1058490.

It is an arithmetic number, because the mean of its divisors is an integer number (55025152).

Almost surely, 2666650565 is an apocalyptic number.

It is an amenable number.

666650565 is a deficient number, since it is larger than the sum of its proper divisors (653953083).

666650565 is a wasteful number, since it uses less digits than its factorization.

666650565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116369 (or 2116366 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 45.

The square root of 666650565 is about 25819.5771653991. The cubic root of 666650565 is about 873.5734316290.

The spelling of 666650565 in words is "six hundred sixty-six million, six hundred fifty thousand, five hundred sixty-five".

Divisors: 1 3 5 7 9 15 21 35 45 63 105 315 2116351 6349053 10581755 14814457 19047159 31745265 44443371 74072285 95235795 133330113 222216855 666650565