51718700000 has 144 divisors (see below), whose sum is σ = 138841144848. Its totient is φ = 18806400000.

The previous prime is 51718699999. The next prime is 51718700009. The reversal of 51718700000 is 781715.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51718700009) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1076492 + ... + 1123508.

It is an arithmetic number, because the mean of its divisors is an integer number (964174617).

Almost surely, 2^51718700000 is an apocalyptic number.

51718700000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51718700000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69420572424).

51718700000 is an abundant number, since it is smaller than the sum of its proper divisors (87122444848).

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

51718700000 is an equidigital number, since it uses as much as digits as its factorization.

51718700000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47063 (or 47035 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 29.

The spelling of 51718700000 in words is "fifty-one billion, seven hundred eighteen million, seven hundred thousand".