51331427613 has 12 divisors (see below), whose sum is σ = 74155403868. Its totient is φ = 34216332480.

The previous prime is 51331427603. The next prime is 51331427627. The reversal of 51331427613 is 31672413315.

51331427613 is a `hidden beast` number, since 5 + 1 + 3 + 3 + 14 + 27 + 613 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 33577997049 + 17753430564 = 183243^2 + 133242^2 .

It is not a de Polignac number, because 51331427613 - 2⁶ = 51331427549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51331427603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 313870 + ... + 448527.

It is an arithmetic number, because the mean of its divisors is an integer number (6179616989).

Almost surely, 2^51331427613 is an apocalyptic number.

It is an amenable number.

51331427613 is a deficient number, since it is larger than the sum of its proper divisors (22823976255).

51331427613 is a wasteful number, since it uses less digits than its factorization.

51331427613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769884 (or 769881 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The spelling of 51331427613 in words is "fifty-one billion, three hundred thirty-one million, four hundred twenty-seven thousand, six hundred thirteen".