65771 has 4 divisors (see below), whose sum is σ = 66600. Its totient is φ = 64944.

The previous prime is 65761. The next prime is 65777. The reversal of 65771 is 17756.

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 65771 - 2⁶ = 65707 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65771.

It is not an unprimeable number, because it can be changed into a prime (65777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281 + ... + 458.

It is an arithmetic number, because the mean of its divisors is an integer number (16650).

2⁶⁵⁷⁷¹ is an apocalyptic number.

65771 is a deficient number, since it is larger than the sum of its proper divisors (829).

65771 is an equidigital number, since it uses as much as digits as its factorization.

65771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 828.

The product of its digits is 1470, while the sum is 26.

The square root of 65771 is about 256.4585736527. The cubic root of 65771 is about 40.3656064502.

The spelling of 65771 in words is "sixty-five thousand, seven hundred seventy-one".