51782218816 has 28 divisors (see below), whose sum is σ = 103079530188. Its totient is φ = 25809423872.

The previous prime is 51782218811. The next prime is 51782218931. The reversal of 51782218816 is 61881228715.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10019209216 + 41763009600 = 100096^2 + 204360^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51782218816.

It is not an unprimeable number, because it can be changed into a prime (51782218811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255891 + ... + 1296466.

Almost surely, 2^51782218816 is an apocalyptic number.

It is an amenable number.

51782218816 is a deficient number, since it is larger than the sum of its proper divisors (51297311372).

51782218816 is a wasteful number, since it uses less digits than its factorization.

51782218816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552686 (or 2552676 counting only the distinct ones).

The product of its digits is 430080, while the sum is 49.

The spelling of 51782218816 in words is "fifty-one billion, seven hundred eighty-two million, two hundred eighteen thousand, eight hundred sixteen".