51326618784 has 120 divisors (see below), whose sum is σ = 157179123360. Its totient is φ = 14664682368.

The previous prime is 51326618747. The next prime is 51326618801. The reversal of 51326618784 is 48781662315.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 119157 + ... + 341835.

It is an arithmetic number, because the mean of its divisors is an integer number (1309826028).

Almost surely, 2^51326618784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51326618784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78589561680).

51326618784 is an abundant number, since it is smaller than the sum of its proper divisors (105852504576).

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

51326618784 is an equidigital number, since it uses as much as digits as its factorization.

51326618784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222720 (or 222691 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The spelling of 51326618784 in words is "fifty-one billion, three hundred twenty-six million, six hundred eighteen thousand, seven hundred eighty-four".