65481813 has 6 divisors (see below), whose sum is σ = 94584854. Its totient is φ = 43654536.

The previous prime is 65481751. The next prime is 65481817. The reversal of 65481813 is 31818456.

It can be written as a sum of positive squares in only one way, i.e., 45927729 + 19554084 = 6777^2 + 4422^2 .

It is not a de Polignac number, because 65481813 - 2⁸ = 65481557 is a prime.

It is a Duffinian number.

It is a congruent 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 5 ways as a sum of consecutive naturals, for example, 3637870 + ... + 3637887.

Almost surely, 2^65481813 is an apocalyptic number.

It is an amenable number.

65481813 is a deficient number, since it is larger than the sum of its proper divisors (29103041).

65481813 is a wasteful number, since it uses less digits than its factorization.

65481813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7275763 (or 7275760 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 65481813 is about 8092.0833535005. The cubic root of 65481813 is about 403.0635866063.

The spelling of 65481813 in words is "sixty-five million, four hundred eighty-one thousand, eight hundred thirteen".