538933445821 has 4 divisors (see below), whose sum is σ = 538983575932. Its totient is φ = 538883315712.

The previous prime is 538933445801. The next prime is 538933445837. The reversal of 538933445821 is 128544339835.

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

It can be written as a sum of positive squares in 2 ways, for example, as 402794584921 + 136138860900 = 634661^2 + 368970^2 .

It is a cyclic number.

It is not a de Polignac number, because 538933445821 - 2⁵ = 538933445789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538933445801) 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, 25048926 + ... + 25070431.

It is an arithmetic number, because the mean of its divisors is an integer number (134745893983).

Almost surely, 2^538933445821 is an apocalyptic number.

It is an amenable number.

538933445821 is a deficient number, since it is larger than the sum of its proper divisors (50130111).

538933445821 is a wasteful number, since it uses less digits than its factorization.

538933445821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50130110.

The product of its digits is 12441600, while the sum is 55.

The spelling of 538933445821 in words is "five hundred thirty-eight billion, nine hundred thirty-three million, four hundred forty-five thousand, eight hundred twenty-one".