65606 has 4 divisors (see below), whose sum is σ = 98412. Its totient is φ = 32802.

The previous prime is 65599. The next prime is 65609. The reversal of 65606 is 60656.

It is a happy number.

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

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65609) by changing a digit.

65606 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16400 + ... + 16403.

It is an arithmetic number, because the mean of its divisors is an integer number (24603).

2⁶⁵⁶⁰⁶ is an apocalyptic number.

65606 is a deficient number, since it is larger than the sum of its proper divisors (32806).

65606 is a wasteful number, since it uses less digits than its factorization.

65606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32805.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 65606 is about 256.1366822616. The cubic root of 65606 is about 40.3318230581.

Subtracting from 65606 its reverse (60656), we obtain a triangular number (4950 = T₉₉).

The spelling of 65606 in words is "sixty-five thousand, six hundred six".