51503318140 has 24 divisors (see below), whose sum is σ = 108442358640. Its totient is φ = 20546967168.

The previous prime is 51503318039. The next prime is 51503318161. The reversal of 51503318140 is 4181330515.

It is a congruent number.

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, 3389737 + ... + 3404896.

It is an arithmetic number, because the mean of its divisors is an integer number (4518431610).

Almost surely, 2^51503318140 is an apocalyptic number.

It is an amenable number.

51503318140 is an abundant number, since it is smaller than the sum of its proper divisors (56939040500).

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

51503318140 is a wasteful number, since it uses less digits than its factorization.

51503318140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6795021 (or 6795019 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 51503318140 its reverse (4181330515), we get a palindrome (55684648655).

The spelling of 51503318140 in words is "fifty-one billion, five hundred three million, three hundred eighteen thousand, one hundred forty".