66528841 has 4 divisors (see below), whose sum is σ = 66545172. Its totient is φ = 66512512.

The previous prime is 66528827. The next prime is 66528853. The reversal of 66528841 is 14882566.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14882566 = 2 ⋅7441283.

It can be written as a sum of positive squares in 2 ways, for example, as 62346816 + 4182025 = 7896^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 66528841 - 2⁷ = 66528713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66528794 and 66528803.

It is not an unprimeable number, because it can be changed into a prime (66520841) 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, 3525 + ... + 12061.

It is an arithmetic number, because the mean of its divisors is an integer number (16636293).

Almost surely, 2^66528841 is an apocalyptic number.

It is an amenable number.

66528841 is a deficient number, since it is larger than the sum of its proper divisors (16331).

66528841 is an equidigital number, since it uses as much as digits as its factorization.

66528841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16330.

The product of its digits is 92160, while the sum is 40.

The square root of 66528841 is about 8156.5213786270. The cubic root of 66528841 is about 405.2005124068.

The spelling of 66528841 in words is "sixty-six million, five hundred twenty-eight thousand, eight hundred forty-one".