51000550056 has 96 divisors (see below), whose sum is σ = 141089382720. Its totient is φ = 16639084800.

The previous prime is 51000549913. The next prime is 51000550061. The reversal of 51000550056 is 65005500015.

51000550056 is a `hidden beast` number, since 5 + 100 + 0 + 5 + 500 + 56 = 666.

It is a super-2 number, since 2×51000550056² (a number of 22 digits) contains 22 as substring.

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, 651501 + ... + 725571.

It is an arithmetic number, because the mean of its divisors is an integer number (1469681070).

Almost surely, 2^51000550056 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 51000550056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70544691360).

51000550056 is an abundant number, since it is smaller than the sum of its proper divisors (90088832664).

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

51000550056 is a wasteful number, since it uses less digits than its factorization.

51000550056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74287 (or 74280 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The spelling of 51000550056 in words is "fifty-one billion, five hundred fifty thousand, fifty-six".