51998873472 has 384 divisors, whose sum is σ = 185454360000. Its totient is φ = 13617856512.

The previous prime is 51998873453. The next prime is 51998873473. The reversal of 51998873472 is 27437889915.

51998873472 is a `hidden beast` number, since 5 + 1 + 9 + 98 + 8 + 73 + 472 = 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 (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51998873473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15618304 + ... + 15621632.

Almost surely, 2^51998873472 is an apocalyptic number.

51998873472 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51998873472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92727180000).

51998873472 is an abundant number, since it is smaller than the sum of its proper divisors (133455486528).

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

51998873472 is a wasteful number, since it uses less digits than its factorization.

51998873472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3518 (or 3503 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 51998873472 in words is "fifty-one billion, nine hundred ninety-eight million, eight hundred seventy-three thousand, four hundred seventy-two".