51544115440 has 40 divisors (see below), whose sum is σ = 122101211808. Its totient is φ = 20228632320.

The previous prime is 51544115423. The next prime is 51544115449. The reversal of 51544115440 is 4451144515.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 51544115396 and 51544115405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51544115449) 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 7 ways as a sum of consecutive naturals, for example, 6074076 + ... + 6082555.

Almost surely, 2^51544115440 is an apocalyptic number.

It is an amenable number.

51544115440 is an abundant number, since it is smaller than the sum of its proper divisors (70557096368).

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

51544115440 is a wasteful number, since it uses less digits than its factorization.

51544115440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12156697 (or 12156691 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 34.

Adding to 51544115440 its reverse (4451144515), we get a palindrome (55995259955).

The spelling of 51544115440 in words is "fifty-one billion, five hundred forty-four million, one hundred fifteen thousand, four hundred forty".