51868218433536 has 896 divisors, whose sum is σ = 164339576832000. Its totient is φ = 16120873746432.

The previous prime is 51868218433523. The next prime is 51868218433579. The reversal of 51868218433536 is 63533481286815.

51868218433536 is a `hidden beast` number, since 5 + 1 + 8 + 6 + 82 + 18 + 4 + 3 + 3 + 536 = 666.

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, 83793567435 + ... + 83793568053.

Almost surely, 2^{51868218433536} 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 51868218433536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82169788416000).

51868218433536 is an abundant number, since it is smaller than the sum of its proper divisors (112471358398464).

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

51868218433536 is a wasteful number, since it uses less digits than its factorization.

51868218433536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957 (or 927 counting only the distinct ones).

The product of its digits is 99532800, while the sum is 63.

The spelling of 51868218433536 in words is "fifty-one trillion, eight hundred sixty-eight billion, two hundred eighteen million, four hundred thirty-three thousand, five hundred thirty-six".