51861216552 has 32 divisors (see below), whose sum is σ = 131429114880. Its totient is φ = 17050262400.

The previous prime is 51861216541. The next prime is 51861216553. The reversal of 51861216552 is 25561216815.

It is not an unprimeable number, because it can be changed into a prime (51861216553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14798824 + ... + 14802327.

It is an arithmetic number, because the mean of its divisors is an integer number (4107159840).

Almost surely, 2^51861216552 is an apocalyptic number.

It is an amenable number.

51861216552 is an abundant number, since it is smaller than the sum of its proper divisors (79567898328).

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

51861216552 is a wasteful number, since it uses less digits than its factorization.

51861216552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29601233 (or 29601229 counting only the distinct ones).

The product of its digits is 144000, while the sum is 42.

The spelling of 51861216552 in words is "fifty-one billion, eight hundred sixty-one million, two hundred sixteen thousand, five hundred fifty-two".