51550778303840 has 384 divisors, whose sum is σ = 128215940065920. Its totient is φ = 19560864153600.

The previous prime is 51550778303819. The next prime is 51550778303929. The reversal of 51550778303840 is 4830387705515.

It is a congruent number.

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, 43650108050 + ... + 43650109230.

It is an arithmetic number, because the mean of its divisors is an integer number (333895677255).

Almost surely, 2^{51550778303840} 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 51550778303840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64107970032960).

51550778303840 is an abundant number, since it is smaller than the sum of its proper divisors (76665161762080).

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

51550778303840 is a wasteful number, since it uses less digits than its factorization.

51550778303840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946 (or 1938 counting only the distinct ones).

The product of its (nonzero) digits is 14112000, while the sum is 56.

The spelling of 51550778303840 in words is "fifty-one trillion, five hundred fifty billion, seven hundred seventy-eight million, three hundred three thousand, eight hundred forty".