65481811 has 4 divisors (see below), whose sum is σ = 65501800. Its totient is φ = 65461824.

The previous prime is 65481751. The next prime is 65481817. The reversal of 65481811 is 11818456.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65481811 - 2¹¹ = 65479763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65481817) 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, 3801 + ... + 12058.

It is an arithmetic number, because the mean of its divisors is an integer number (16375450).

Almost surely, 2^65481811 is an apocalyptic number.

65481811 is a deficient number, since it is larger than the sum of its proper divisors (19989).

65481811 is a wasteful number, since it uses less digits than its factorization.

65481811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19988.

The product of its digits is 7680, while the sum is 34.

The square root of 65481811 is about 8092.0832299229. The cubic root of 65481811 is about 403.0635825028.

The spelling of 65481811 in words is "sixty-five million, four hundred eighty-one thousand, eight hundred eleven".