51543434320 has 160 divisors (see below), whose sum is σ = 138096161280. Its totient is φ = 17525913600.

The previous prime is 51543434303. The next prime is 51543434321. The reversal of 51543434320 is 2343434515.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51543434321) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 39617670 + ... + 39618970.

It is an arithmetic number, because the mean of its divisors is an integer number (863101008).

Almost surely, 2^51543434320 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 51543434320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69048080640).

51543434320 is an abundant number, since it is smaller than the sum of its proper divisors (86552726960).

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

51543434320 is a wasteful number, since it uses less digits than its factorization.

51543434320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853 (or 1847 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 34.

Adding to 51543434320 its reverse (2343434515), we get a palindrome (53886868835).

The spelling of 51543434320 in words is "fifty-one billion, five hundred forty-three million, four hundred thirty-four thousand, three hundred twenty".