51565655052 has 96 divisors (see below), whose sum is σ = 134661542400. Its totient is φ = 17063925696.

The previous prime is 51565655047. The next prime is 51565655111. The reversal of 51565655052 is 25055656515.

It is a junction number, because it is equal to n+sod(n) for n = 51565654989 and 51565655007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9141649 + ... + 9147287.

It is an arithmetic number, because the mean of its divisors is an integer number (1402724400).

Almost surely, 2^51565655052 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51565655052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67330771200).

51565655052 is an abundant number, since it is smaller than the sum of its proper divisors (83095887348).

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

51565655052 is a wasteful number, since it uses less digits than its factorization.

51565655052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6252 (or 6244 counting only the distinct ones).

The product of its (nonzero) digits is 1125000, while the sum is 45.

The spelling of 51565655052 in words is "fifty-one billion, five hundred sixty-five million, six hundred fifty-five thousand, fifty-two".