51994716480 has 560 divisors, whose sum is σ = 212167866240. Its totient is φ = 11840090112.

The previous prime is 51994716469. The next prime is 51994716509. The reversal of 51994716480 is 8461749915.

51994716480 is a `hidden beast` number, since 5 + 1 + 9 + 94 + 71 + 6 + 480 = 666.

It is a tau number, because it is divible by the number of its divisors (560).

It is a super-3 number, since 3×51994716480³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 92352679 + ... + 92353241.

Almost surely, 2^51994716480 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 51994716480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106083933120).

51994716480 is an abundant number, since it is smaller than the sum of its proper divisors (160173149760).

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

51994716480 is a wasteful number, since it uses less digits than its factorization.

51994716480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108 (or 1089 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 51994716480 in words is "fifty-one billion, nine hundred ninety-four million, seven hundred sixteen thousand, four hundred eighty".