51145040440 has 64 divisors (see below), whose sum is σ = 123955171200. Its totient is φ = 18880238592.

The previous prime is 51145040423. The next prime is 51145040449. The reversal of 51145040440 is 4404054115.

It is a junction number, because it is equal to n+sod(n) for n = 51145040399 and 51145040408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51145040449) 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 15 ways as a sum of consecutive naturals, for example, 3525121 + ... + 3539599.

It is an arithmetic number, because the mean of its divisors is an integer number (1936799550).

Almost surely, 2^51145040440 is an apocalyptic number.

It is an amenable number.

51145040440 is an abundant number, since it is smaller than the sum of its proper divisors (72810130760).

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

51145040440 is a wasteful number, since it uses less digits than its factorization.

51145040440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21296 (or 21292 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 51145040440 its reverse (4404054115), we get a palindrome (55549094555).

The spelling of 51145040440 in words is "fifty-one billion, one hundred forty-five million, forty thousand, four hundred forty".