65503 has 4 divisors (see below), whose sum is σ = 67648. Its totient is φ = 63360.

The previous prime is 65497. The next prime is 65519. The reversal of 65503 is 30556.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65503 is a prime.

It is a Duffinian number.

65503 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65543) 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, 1026 + ... + 1087.

It is an arithmetic number, because the mean of its divisors is an integer number (16912).

2⁶⁵⁵⁰³ is an apocalyptic number.

65503 is a deficient number, since it is larger than the sum of its proper divisors (2145).

65503 is a wasteful number, since it uses less digits than its factorization.

65503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144.

The product of its (nonzero) digits is 450, while the sum is 19.

The square root of 65503 is about 255.9355387593. The cubic root of 65503 is about 40.3107053064.

The spelling of 65503 in words is "sixty-five thousand, five hundred three".