51013555540 has 24 divisors (see below), whose sum is σ = 107140152672. Its totient is φ = 20403196320.

The previous prime is 51013555529. The next prime is 51013555559. The reversal of 51013555540 is 4555531015.

It is a junction number, because it is equal to n+sod(n) for n = 51013555496 and 51013555505.

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, 55447 + ... + 324193.

It is an arithmetic number, because the mean of its divisors is an integer number (4464173028).

Almost surely, 2^51013555540 is an apocalyptic number.

It is an amenable number.

51013555540 is an abundant number, since it is smaller than the sum of its proper divisors (56126597132).

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

51013555540 is a wasteful number, since it uses less digits than its factorization.

51013555540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278247 (or 278245 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 34.

The spelling of 51013555540 in words is "fifty-one billion, thirteen million, five hundred fifty-five thousand, five hundred forty".