51538437543 has 4 divisors (see below), whose sum is σ = 68717916728. Its totient is φ = 34358958360.

The previous prime is 51538437541. The next prime is 51538437551. The reversal of 51538437543 is 34573483515.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51538437543 - 2¹ = 51538437541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51538437492 and 51538437501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51538437541) 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, 8589739588 + ... + 8589739593.

It is an arithmetic number, because the mean of its divisors is an integer number (17179479182).

Almost surely, 2^51538437543 is an apocalyptic number.

51538437543 is a deficient number, since it is larger than the sum of its proper divisors (17179479185).

51538437543 is a wasteful number, since it uses less digits than its factorization.

51538437543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17179479184.

The product of its digits is 3024000, while the sum is 48.

The spelling of 51538437543 in words is "fifty-one billion, five hundred thirty-eight million, four hundred thirty-seven thousand, five hundred forty-three".