51449784960 has 128 divisors (see below), whose sum is σ = 187424265600. Its totient is φ = 11759947776.

The previous prime is 51449784949. The next prime is 51449784977. The reversal of 51449784960 is 6948794415.

51449784960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 51449784960.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1900615 + ... + 1927494.

It is an arithmetic number, because the mean of its divisors is an integer number (1464252075).

Almost surely, 2^51449784960 is an apocalyptic number.

It is an amenable number.

51449784960 is an abundant number, since it is smaller than the sum of its proper divisors (135974480640).

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

51449784960 is a wasteful number, since it uses less digits than its factorization.

51449784960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3828138 (or 3828126 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 51449784960 in words is "fifty-one billion, four hundred forty-nine million, seven hundred eighty-four thousand, nine hundred sixty".