51243433520 has 40 divisors (see below), whose sum is σ = 119521683456. Its totient is φ = 20431876608.

The previous prime is 51243433519. The next prime is 51243433529. The reversal of 51243433520 is 2533434215.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (51243433529) 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, 998192 + ... + 1048271.

Almost surely, 2^51243433520 is an apocalyptic number.

It is an amenable number.

51243433520 is an abundant number, since it is smaller than the sum of its proper divisors (68278249936).

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

51243433520 is a wasteful number, since it uses less digits than its factorization.

51243433520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046789 (or 2046783 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 51243433520 its reverse (2533434215), we get a palindrome (53776867735).

The spelling of 51243433520 in words is "fifty-one billion, two hundred forty-three million, four hundred thirty-three thousand, five hundred twenty".