51550065420 has 192 divisors, whose sum is σ = 167691955200. Its totient is φ = 11589350400.

The previous prime is 51550065401. The next prime is 51550065431. The reversal of 51550065420 is 2456005515.

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, 6359370 + ... + 6367470.

It is an arithmetic number, because the mean of its divisors is an integer number (873395600).

Almost surely, 2^51550065420 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 51550065420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83845977600).

51550065420 is an abundant number, since it is smaller than the sum of its proper divisors (116141889780).

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

51550065420 is a wasteful number, since it uses less digits than its factorization.

51550065420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8368 (or 8366 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 33.

The spelling of 51550065420 in words is "fifty-one billion, five hundred fifty million, sixty-five thousand, four hundred twenty".