51698532384 has 144 divisors (see below), whose sum is σ = 152009184600. Its totient is φ = 16654049280.

The previous prime is 51698532343. The next prime is 51698532409. The reversal of 51698532384 is 48323589615.

51698532384 is a `hidden beast` number, since 5 + 16 + 98 + 532 + 3 + 8 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 48853376784 + 2845155600 = 221028^2 + 53340^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 51698532384.

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, 1571464 + ... + 1604024.

Almost surely, 2^51698532384 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 51698532384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76004592300).

51698532384 is an abundant number, since it is smaller than the sum of its proper divisors (100310652216).

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

51698532384 is a wasteful number, since it uses less digits than its factorization.

51698532384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32763 (or 32752 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The spelling of 51698532384 in words is "fifty-one billion, six hundred ninety-eight million, five hundred thirty-two thousand, three hundred eighty-four".