51563998336 has 128 divisors (see below), whose sum is σ = 109014776640. Its totient is φ = 24263393280.

The previous prime is 51563998271. The next prime is 51563998373. The reversal of 51563998336 is 63389936515.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18728736 + ... + 18731488.

Almost surely, 2^51563998336 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 51563998336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54507388320).

51563998336 is an abundant number, since it is smaller than the sum of its proper divisors (57450778304).

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

51563998336 is a wasteful number, since it uses less digits than its factorization.

51563998336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934 (or 2922 counting only the distinct ones).

The product of its digits is 15746400, while the sum is 58.

The spelling of 51563998336 in words is "fifty-one billion, five hundred sixty-three million, nine hundred ninety-eight thousand, three hundred thirty-six".