65666841 has 16 divisors (see below), whose sum is σ = 89610624. Its totient is φ = 42758144.

The previous prime is 65666813. The next prime is 65666851. The reversal of 65666841 is 14866656.

It is a cyclic number.

It is not a de Polignac number, because 65666841 - 2¹⁸ = 65404697 is a prime.

Its product of digits (207360) is a multiple of the sum of its prime divisors (1920).

It is a junction number, because it is equal to n+sod(n) for n = 65666793 and 65666802.

It is not an unprimeable number, because it can be changed into a prime (65666851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40060 + ... + 41666.

It is an arithmetic number, because the mean of its divisors is an integer number (5600664).

Almost surely, 2^65666841 is an apocalyptic number.

It is an amenable number.

65666841 is a deficient number, since it is larger than the sum of its proper divisors (23943783).

65666841 is a wasteful number, since it uses less digits than its factorization.

65666841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920.

The product of its digits is 207360, while the sum is 42.

The square root of 65666841 is about 8103.5079440943. The cubic root of 65666841 is about 403.4428670629.

The spelling of 65666841 in words is "sixty-five million, six hundred sixty-six thousand, eight hundred forty-one".