65941809 has 8 divisors (see below), whose sum is σ = 87960000. Its totient is φ = 43942416.

The previous prime is 65941753. The next prime is 65941823. The reversal of 65941809 is 90814956.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65941809 - 2⁹ = 65941297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65941859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10692 + ... + 15690.

It is an arithmetic number, because the mean of its divisors is an integer number (10995000).

Almost surely, 2^65941809 is an apocalyptic number.

It is an amenable number.

65941809 is a deficient number, since it is larger than the sum of its proper divisors (22018191).

65941809 is a wasteful number, since it uses less digits than its factorization.

65941809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9399.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 65941809 is about 8120.4562063963. The cubic root of 65941809 is about 404.0051975445.

The spelling of 65941809 in words is "sixty-five million, nine hundred forty-one thousand, eight hundred nine".