51504400140 has 24 divisors (see below), whose sum is σ = 144212320560. Its totient is φ = 13734506688.

The previous prime is 51504400117. The next prime is 51504400187. The reversal of 51504400140 is 4100440515.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 51504400140.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429203275 + ... + 429203394.

It is an arithmetic number, because the mean of its divisors is an integer number (6008846690).

Almost surely, 2^51504400140 is an apocalyptic number.

It is an amenable number.

51504400140 is an abundant number, since it is smaller than the sum of its proper divisors (92707920420).

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

51504400140 is a wasteful number, since it uses less digits than its factorization.

51504400140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858406681 (or 858406679 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 51504400140 its reverse (4100440515), we get a palindrome (55604840655).

The spelling of 51504400140 in words is "fifty-one billion, five hundred four million, four hundred thousand, one hundred forty".