51481846563840 has 4928 divisors, whose sum is σ = 251363369553408. Its totient is φ = 9784472371200.

The previous prime is 51481846563821. The next prime is 51481846563893. The reversal of 51481846563840 is 4836564818415.

51481846563840 is a `hidden beast` number, since 5 + 1 + 481 + 84 + 6 + 5 + 6 + 38 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (4928).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 447 ways as a sum of consecutive naturals, for example, 200318468992 + ... + 200318469248.

Almost surely, 2^{51481846563840} 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 51481846563840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125681684776704).

51481846563840 is an abundant number, since it is smaller than the sum of its proper divisors (199881522989568).

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

51481846563840 is a wasteful number, since it uses less digits than its factorization.

51481846563840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 88473600, while the sum is 63.

The spelling of 51481846563840 in words is "fifty-one trillion, four hundred eighty-one billion, eight hundred forty-six million, five hundred sixty-three thousand, eight hundred forty".