50891821056 has 312 divisors, whose sum is σ = 154684872576. Its totient is φ = 16090398720.

The previous prime is 50891821021. The next prime is 50891821063. The reversal of 50891821056 is 65012819805.

It is a happy number.

50891821056 is a `hidden beast` number, since 508 + 9 + 1 + 82 + 10 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163639141 + ... + 163639451.

It is an arithmetic number, because the mean of its divisors is an integer number (495784848).

Almost surely, 2^50891821056 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 50891821056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77342436288).

50891821056 is an abundant number, since it is smaller than the sum of its proper divisors (103793051520).

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

50891821056 is a wasteful number, since it uses less digits than its factorization.

50891821056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 50891821056 in words is "fifty billion, eight hundred ninety-one million, eight hundred twenty-one thousand, fifty-six".