51815688448 has 36 divisors (see below), whose sum is σ = 104183998380. Its totient is φ = 25718718464.

The previous prime is 51815688401. The next prime is 51815688467. The reversal of 51815688448 is 84488651815.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12788895744 + 39026792704 = 113088^2 + 197552^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51815688392 and 51815688401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703633 + ... + 773776.

It is an arithmetic number, because the mean of its divisors is an integer number (2893999955).

Almost surely, 2^51815688448 is an apocalyptic number.

It is an amenable number.

51815688448 is an abundant number, since it is smaller than the sum of its proper divisors (52368309932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51815688448 is a wasteful number, since it uses less digits than its factorization.

51815688448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477562 (or 1477548 counting only the distinct ones).

The product of its digits is 9830400, while the sum is 58.

The spelling of 51815688448 in words is "fifty-one billion, eight hundred fifteen million, six hundred eighty-eight thousand, four hundred forty-eight".