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66609 = 332467
BaseRepresentation
bin10000010000110001
310101101000
4100100301
54112414
61232213
7365124
oct202061
9111330
1066609
1146054
1232669
132441a
141a3bb
1514b09
hex10431

66609 has 8 divisors (see below), whose sum is σ = 98720. Its totient is φ = 44388.

The previous prime is 66601. The next prime is 66617. The reversal of 66609 is 90666.

It is an interprime number because it is at equal distance from previous prime (66601) and next prime (66617).

It is not a de Polignac number, because 66609 - 23 = 66601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2467 = 66609 / (6 + 6 + 6 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1207 + ... + 1260.

It is an arithmetic number, because the mean of its divisors is an integer number (12340).

266609 is an apocalyptic number.

It is an amenable number.

66609 is a deficient number, since it is larger than the sum of its proper divisors (32111).

66609 is a wasteful number, since it uses less digits than its factorization.

66609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476 (or 2470 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 66609 is about 258.0871945680. The cubic root of 66609 is about 40.5363185874.

The spelling of 66609 in words is "sixty-six thousand, six hundred nine".

Divisors: 1 3 9 27 2467 7401 22203 66609