51138875560 has 16 divisors (see below), whose sum is σ = 115062470100. Its totient is φ = 20455550208.

The previous prime is 51138875549. The next prime is 51138875617. The reversal of 51138875560 is 6557883115.

It can be written as a sum of positive squares in 2 ways, for example, as 50898067236 + 240808324 = 225606^2 + 15518^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 639235905 + ... + 639235984.

Almost surely, 2^51138875560 is an apocalyptic number.

It is an amenable number.

51138875560 is an abundant number, since it is smaller than the sum of its proper divisors (63923594540).

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

51138875560 is a wasteful number, since it uses less digits than its factorization.

51138875560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278471900 (or 1278471896 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 49.

The spelling of 51138875560 in words is "fifty-one billion, one hundred thirty-eight million, eight hundred seventy-five thousand, five hundred sixty".