51718033920 has 640 divisors, whose sum is σ = 199755072000. Its totient is φ = 11396775936.

The previous prime is 51718033897. The next prime is 51718033931. The reversal of 51718033920 is 2933081715.

It is a tau number, because it is divible by the number of its divisors (640).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 76392622 + ... + 76393298.

It is an arithmetic number, because the mean of its divisors is an integer number (312117300).

Almost surely, 2^51718033920 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 51718033920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99877536000).

51718033920 is an abundant number, since it is smaller than the sum of its proper divisors (148037038080).

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

51718033920 is an equidigital number, since it uses as much as digits as its factorization.

51718033920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The spelling of 51718033920 in words is "fifty-one billion, seven hundred eighteen million, thirty-three thousand, nine hundred twenty".