65801 has 4 divisors (see below), whose sum is σ = 68100. Its totient is φ = 63504.

The previous prime is 65789. The next prime is 65809. The reversal of 65801 is 10856.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15625 + 50176 = 125^2 + 224^2 .

It is a cyclic number.

It is not a de Polignac number, because 65801 - 2¹⁴ = 49417 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65809) 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, 1106 + ... + 1163.

It is an arithmetic number, because the mean of its divisors is an integer number (17025).

2⁶⁵⁸⁰¹ is an apocalyptic number.

It is an amenable number.

65801 is a deficient number, since it is larger than the sum of its proper divisors (2299).

65801 is a wasteful number, since it uses less digits than its factorization.

65801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 65801 is about 256.5170559631. The cubic root of 65801 is about 40.3717428128.

Subtracting from 65801 its reverse (10856), we obtain a palindrome (54945).

The spelling of 65801 in words is "sixty-five thousand, eight hundred one".