65553 has 4 divisors (see below), whose sum is σ = 87408.
Its totient is φ = 43700.
The previous prime is 65551. The next prime is 65557. The reversal of 65553 is 35556.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 65553 - 21 = 65551 is a prime.
It is a D-number.
65553 is a lucky number.
It is a nialpdrome in base 10.
It is not an unprimeable number, because it can be changed into a prime (65551) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (3) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10923 + ... + 10928.
It is an arithmetic number, because the mean of its divisors is an integer number (21852).
265553 is an apocalyptic number.
It is an amenable number.
65553 is a deficient number, since it is larger than the sum of its proper divisors (21855).
65553 is a wasteful number, since it uses less digits than its factorization.
65553 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 21854.
The product of its digits is 2250, while the sum is 24.
The square root of 65553 is about 256.0332009721.
The cubic root of 65553 is about 40.3209594049.
The spelling of 65553 in words is "sixty-five thousand, five hundred fifty-three".