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665345 = 5133069
BaseRepresentation
bin10100010011100000001
31020210200102
42202130001
5132242340
622132145
75440532
oct2423401
91223612
10665345
1141497a
12281055
131a3ac5
14134689
15d2215
hexa2701

665345 has 4 divisors (see below), whose sum is σ = 798420. Its totient is φ = 532272.

The previous prime is 665311. The next prime is 665351. The reversal of 665345 is 543566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 461041 + 204304 = 679^2 + 452^2 .

It is a cyclic number.

It is not a de Polignac number, because 665345 - 28 = 665089 is a prime.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665345.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 66530 + ... + 66539.

It is an arithmetic number, because the mean of its divisors is an integer number (199605).

2665345 is an apocalyptic number.

It is an amenable number.

665345 is a deficient number, since it is larger than the sum of its proper divisors (133075).

665345 is a wasteful number, since it uses less digits than its factorization.

665345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133074.

The product of its digits is 10800, while the sum is 29.

The square root of 665345 is about 815.6868271586. The cubic root of 665345 is about 87.3002791732.

The spelling of 665345 in words is "six hundred sixty-five thousand, three hundred forty-five".

Divisors: 1 5 133069 665345