66841 has 2 divisors, whose sum is σ = 66842. Its totient is φ = 66840.

The previous prime is 66821. The next prime is 66851. The reversal of 66841 is 14866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52441 + 14400 = 229^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 66841 - 2⁵ = 66809 is a prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (66821) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33420 + 33421.

It is an arithmetic number, because the mean of its divisors is an integer number (33421).

2⁶⁶⁸⁴¹ is an apocalyptic number.

It is an amenable number.

66841 is a deficient number, since it is larger than the sum of its proper divisors (1).

66841 is an equidigital number, since it uses as much as digits as its factorization.

66841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 66841 is about 258.5362643808. The cubic root of 66841 is about 40.5833268916.

Adding to 66841 its sum of digits (25), we get a palindrome (66866).

The spelling of 66841 in words is "sixty-six thousand, eight hundred forty-one".