65911 has 4 divisors (see below), whose sum is σ = 69400. Its totient is φ = 62424.

The previous prime is 65899. The next prime is 65921. The reversal of 65911 is 11956.

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 65911 - 2¹¹ = 63863 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65921) 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, 1716 + ... + 1753.

It is an arithmetic number, because the mean of its divisors is an integer number (17350).

2⁶⁵⁹¹¹ is an apocalyptic number.

65911 is a deficient number, since it is larger than the sum of its proper divisors (3489).

65911 is a wasteful number, since it uses less digits than its factorization.

65911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3488.

The product of its digits is 270, while the sum is 22.

The square root of 65911 is about 256.7313771240. The cubic root of 65911 is about 40.3942268652.

The spelling of 65911 in words is "sixty-five thousand, nine hundred eleven".