51443320520 has 16 divisors (see below), whose sum is σ = 115747471260. Its totient is φ = 20577328192.

The previous prime is 51443320519. The next prime is 51443320529. The reversal of 51443320520 is 2502334415.

It is a happy number.

51443320520 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 50184064324 + 1259256196 = 224018^2 + 35486^2 .

It is a super-2 number, since 2×51443320520² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51443320529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 643041467 + ... + 643041546.

Almost surely, 2^51443320520 is an apocalyptic number.

It is an amenable number.

51443320520 is an abundant number, since it is smaller than the sum of its proper divisors (64304150740).

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

51443320520 is a wasteful number, since it uses less digits than its factorization.

51443320520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286083024 (or 1286083020 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 51443320520 its reverse (2502334415), we get a palindrome (53945654935).

The spelling of 51443320520 in words is "fifty-one billion, four hundred forty-three million, three hundred twenty thousand, five hundred twenty".