51438356768 has 18 divisors (see below), whose sum is σ = 101271790809. Its totient is φ = 25718536896.

The previous prime is 51438356759. The next prime is 51438356773. The reversal of 51438356768 is 86765383415.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 37951715344 + 13486641424 = 194812^2 + 116132^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=160372.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1262930 + ... + 1303022.

Almost surely, 2^51438356768 is an apocalyptic number.

It is an amenable number.

51438356768 is a deficient number, since it is larger than the sum of its proper divisors (49833434041).

51438356768 is an frugal number, since it uses more digits than its factorization.

51438356768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80196 (or 40095 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 56.

The spelling of 51438356768 in words is "fifty-one billion, four hundred thirty-eight million, three hundred fifty-six thousand, seven hundred sixty-eight".