51941715840 has 384 divisors, whose sum is σ = 209758348800. Its totient is φ = 11595902976.

The previous prime is 51941715751. The next prime is 51941715841. The reversal of 51941715840 is 4851714915.

51941715840 is a `hidden beast` number, since 51 + 9 + 4 + 17 + 1 + 584 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51941715841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1718781 + ... + 1748739.

It is an arithmetic number, because the mean of its divisors is an integer number (546245700).

Almost surely, 2^51941715840 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 51941715840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104879174400).

51941715840 is an abundant number, since it is smaller than the sum of its proper divisors (157816632960).

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

51941715840 is a wasteful number, since it uses less digits than its factorization.

51941715840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30034 (or 30019 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The spelling of 51941715840 in words is "fifty-one billion, nine hundred forty-one million, seven hundred fifteen thousand, eight hundred forty".