51565531550412 has 144 divisors (see below), whose sum is σ = 135893769822720. Its totient is φ = 15196063893120.

The previous prime is 51565531550399. The next prime is 51565531550419. The reversal of 51565531550412 is 21405513556515.

It is not an unprimeable number, because it can be changed into a prime (51565531550419) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108661789 + ... + 109135307.

It is an arithmetic number, because the mean of its divisors is an integer number (943706734880).

Almost surely, 2^{51565531550412} 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 51565531550412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67946884911360).

51565531550412 is an abundant number, since it is smaller than the sum of its proper divisors (84328238272308).

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

51565531550412 is a wasteful number, since it uses less digits than its factorization.

51565531550412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475612 (or 475599 counting only the distinct ones).

The product of its (nonzero) digits is 2250000, while the sum is 48.

The spelling of 51565531550412 in words is "fifty-one trillion, five hundred sixty-five billion, five hundred thirty-one million, five hundred fifty thousand, four hundred twelve".