51332140240 has 20 divisors (see below), whose sum is σ = 119347226244. Its totient is φ = 20532856064.

The previous prime is 51332140201. The next prime is 51332140253. The reversal of 51332140240 is 4204123315.

51332140240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 16387072144 + 34945068096 = 128012^2 + 186936^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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, 320825797 + ... + 320825956.

Almost surely, 2^51332140240 is an apocalyptic number.

It is an amenable number.

51332140240 is an abundant number, since it is smaller than the sum of its proper divisors (68015086004).

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

51332140240 is a wasteful number, since it uses less digits than its factorization.

51332140240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641651766 (or 641651760 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 51332140240 its reverse (4204123315), we get a palindrome (55536263555).

The spelling of 51332140240 in words is "fifty-one billion, three hundred thirty-two million, one hundred forty thousand, two hundred forty".