51326510065543 has 4 divisors (see below), whose sum is σ = 51903212425920. Its totient is φ = 50749807705168.

The previous prime is 51326510065529. The next prime is 51326510065547. The reversal of 51326510065543 is 34556001562315.

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

It is a cyclic number.

It is not a de Polignac number, because 51326510065543 - 2³⁷ = 51189071112071 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51326510065493 and 51326510065502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51326510065547) 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, 288351180055 + ... + 288351180232.

It is an arithmetic number, because the mean of its divisors is an integer number (12975803106480).

Almost surely, 2^{51326510065543} is an apocalyptic number.

51326510065543 is a deficient number, since it is larger than the sum of its proper divisors (576702360377).

51326510065543 is an equidigital number, since it uses as much as digits as its factorization.

51326510065543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576702360376.

The product of its (nonzero) digits is 1620000, while the sum is 46.

The spelling of 51326510065543 in words is "fifty-one trillion, three hundred twenty-six billion, five hundred ten million, sixty-five thousand, five hundred forty-three".