65643 has 4 divisors (see below), whose sum is σ = 87528. Its totient is φ = 43760.
The previous prime is 65633. The next prime is 65647. The reversal of 65643 is 34656.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 65643 - 26 = 65579 is a prime.
It is a D-number.
It is not an unprimeable number, because it can be changed into a prime (65647) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10938 + ... + 10943.
It is an arithmetic number, because the mean of its divisors is an integer number (21882).
265643 is an apocalyptic number.
65643 is a deficient number, since it is larger than the sum of its proper divisors (21885).
65643 is a wasteful number, since it uses less digits than its factorization.
65643 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 21884.
The product of its digits is 2160, while the sum is 24.
The square root of 65643 is about 256.2088991429. The cubic root of 65643 is about 40.3394036504.
The spelling of 65643 in words is "sixty-five thousand, six hundred forty-three".
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