66220241 has 4 divisors (see below), whose sum is σ = 66242484. Its totient is φ = 66198000.

The previous prime is 66220229. The next prime is 66220261. The reversal of 66220241 is 14202266.

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 19009600 + 47210641 = 4360^2 + 6871^2 .

It is a cyclic number.

It is not a de Polignac number, because 66220241 - 2¹⁰ = 66219217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66220211) 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, 5810 + ... + 12891.

It is an arithmetic number, because the mean of its divisors is an integer number (16560621).

Almost surely, 2^66220241 is an apocalyptic number.

It is an amenable number.

66220241 is a deficient number, since it is larger than the sum of its proper divisors (22243).

66220241 is a wasteful number, since it uses less digits than its factorization.

66220241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22242.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 66220241 is about 8137.5820118755. The cubic root of 66220241 is about 404.5730215322.

The spelling of 66220241 in words is "sixty-six million, two hundred twenty thousand, two hundred forty-one".