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66445 = 597137
BaseRepresentation
bin10000001110001101
310101010221
4100032031
54111240
61231341
7364501
oct201615
9111127
1066445
1145a15
1232551
1324322
141a301
1514a4a
hex1038d

66445 has 8 divisors (see below), whose sum is σ = 81144. Its totient is φ = 52224.

The previous prime is 66431. The next prime is 66449. The reversal of 66445 is 54466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7396 + 59049 = 86^2 + 243^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66445 - 25 = 66413 is a prime.

It is a d-powerful number, because it can be written as 63 + 66 + 43 + 47 + 55 .

It is a Duffinian number.

66445 is a lucky number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417 + ... + 553.

It is an arithmetic number, because the mean of its divisors is an integer number (10143).

266445 is an apocalyptic number.

It is an amenable number.

66445 is a deficient number, since it is larger than the sum of its proper divisors (14699).

66445 is a wasteful number, since it uses less digits than its factorization.

66445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239.

The product of its digits is 2880, while the sum is 25.

The square root of 66445 is about 257.7692766797. The cubic root of 66445 is about 40.5030226876.

The spelling of 66445 in words is "sixty-six thousand, four hundred forty-five".

Divisors: 1 5 97 137 485 685 13289 66445