51543748643 has 4 divisors (see below), whose sum is σ = 51573700248. Its totient is φ = 51513797040.

The previous prime is 51543748631. The next prime is 51543748649. The reversal of 51543748643 is 34684734515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34684734515 = 5 ⋅6936946903.

It is a cyclic number.

It is not a de Polignac number, because 51543748643 - 2⁶ = 51543748579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51543748591 and 51543748600.

It is not an unprimeable number, because it can be changed into a prime (51543748649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14973221 + ... + 14976662.

It is an arithmetic number, because the mean of its divisors is an integer number (12893425062).

Almost surely, 2^51543748643 is an apocalyptic number.

51543748643 is a deficient number, since it is larger than the sum of its proper divisors (29951605).

51543748643 is a wasteful number, since it uses less digits than its factorization.

51543748643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29951604.

The product of its digits is 4838400, while the sum is 50.

The spelling of 51543748643 in words is "fifty-one billion, five hundred forty-three million, seven hundred forty-eight thousand, six hundred forty-three".