53218744817 has 18 divisors (see below), whose sum is σ = 65557340118. Its totient is φ = 42927397632.

The previous prime is 53218744807. The next prime is 53218744823. The reversal of 53218744817 is 71844781235.

It can be written as a sum of positive squares in 3 ways, for example, as 170981776 + 53047763041 = 13076^2 + 230321^2 .

It is not a de Polignac number, because 53218744817 - 2⁴ = 53218744801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53218744807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6654173 + ... + 6662165.

It is an arithmetic number, because the mean of its divisors is an integer number (3642074451).

Almost surely, 2^53218744817 is an apocalyptic number.

It is an amenable number.

53218744817 is a deficient number, since it is larger than the sum of its proper divisors (12338595301).

53218744817 is an frugal number, since it uses more digits than its factorization.

53218744817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16017 (or 8017 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 50.

The spelling of 53218744817 in words is "fifty-three billion, two hundred eighteen million, seven hundred forty-four thousand, eight hundred seventeen".