65611 has 12 divisors (see below), whose sum is σ = 82992. Its totient is φ = 51408.

The previous prime is 65609. The next prime is 65617. The reversal of 65611 is 11656.

It is not a de Polignac number, because 65611 - 2¹ = 65609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 586 + ... + 688.

It is an arithmetic number, because the mean of its divisors is an integer number (6916).

2⁶⁵⁶¹¹ is an apocalyptic number.

65611 is a deficient number, since it is larger than the sum of its proper divisors (17381).

65611 is a wasteful number, since it uses less digits than its factorization.

65611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 123 counting only the distinct ones).

The product of its digits is 180, while the sum is 19.

The square root of 65611 is about 256.1464424894. The cubic root of 65611 is about 40.3328476290.

It can be divided in two parts, 65 and 611, that added together give a palindrome (676).

The spelling of 65611 in words is "sixty-five thousand, six hundred eleven".