65431806813 has 12 divisors (see below), whose sum is σ = 94537748448. Its totient is φ = 43609602120.

The previous prime is 65431806767. The next prime is 65431806893. The reversal of 65431806813 is 31860813456.

65431806813 is a `hidden beast` number, since 65 + 431 + 80 + 6 + 81 + 3 = 666.

65431806813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65431806813 - 2²¹ = 65429709661 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65431806893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 931083 + ... + 998888.

It is an arithmetic number, because the mean of its divisors is an integer number (7878145704).

Almost surely, 2^65431806813 is an apocalyptic number.

It is an amenable number.

65431806813 is a deficient number, since it is larger than the sum of its proper divisors (29105941635).

65431806813 is a wasteful number, since it uses less digits than its factorization.

65431806813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933744 (or 1933741 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 65431806813 in words is "sixty-five billion, four hundred thirty-one million, eight hundred six thousand, eight hundred thirteen".