66441 has 4 divisors (see below), whose sum is σ = 88592. Its totient is φ = 44292.

The previous prime is 66431. The next prime is 66449. The reversal of 66441 is 14466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66441 - 2⁶ = 66377 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66449) 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, 11071 + ... + 11076.

It is an arithmetic number, because the mean of its divisors is an integer number (22148).

2⁶⁶⁴⁴¹ is an apocalyptic number.

It is an amenable number.

66441 is a deficient number, since it is larger than the sum of its proper divisors (22151).

66441 is a wasteful number, since it uses less digits than its factorization.

66441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22150.

The product of its digits is 576, while the sum is 21.

The square root of 66441 is about 257.7615176864. The cubic root of 66441 is about 40.5022099084.

The spelling of 66441 in words is "sixty-six thousand, four hundred forty-one".