65041821 has 24 divisors (see below), whose sum is σ = 101457720. Its totient is φ = 39914496.

The previous prime is 65041811. The next prime is 65041829. The reversal of 65041821 is 12814056.

65041821 is a `hidden beast` number, since 650 + 4 + 1 + 8 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4901796 + 60140025 = 2214^2 + 7755^2 .

It is not a de Polignac number, because 65041821 - 2²² = 60847517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65041829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66085 + ... + 67061.

It is an arithmetic number, because the mean of its divisors is an integer number (4227405).

Almost surely, 2^65041821 is an apocalyptic number.

It is an amenable number.

65041821 is a deficient number, since it is larger than the sum of its proper divisors (36415899).

65041821 is a wasteful number, since it uses less digits than its factorization.

65041821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565 (or 1562 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 65041821 is about 8064.8509595652. The cubic root of 65041821 is about 402.1587885369.

Adding to 65041821 its reverse (12814056), we get a palindrome (77855877).

The spelling of 65041821 in words is "sixty-five million, forty-one thousand, eight hundred twenty-one".